CCNA Routing & Switching

CCNA CCNP Online Training offer suite of CISCO Certification training Online courses covering some of the most sort after technologies in Cisco. We currently cover Cisco Design, Cisco Network Security, Cisco Routing & Switching, Cisco Voice and Cisco Wireless. Whether you are looking at starting or furthering your career in Cisco or exploring opportunities to up-skill your team as a business, ccna online training courses and CISCO certification training program is ideally designed for you. Our Learning Consultants are always happy to guide you should you need advice or support in selecting the right course for you or your team.

The developing businesses of data and correspondence advancements are in a steady need of experts. CCNA accreditation guarantees that the confirmed applicant is prepared to work with the most widely recognized systems administration angles. It is sketched out with an extensive course with satisfactory specialized learning in addition to down to earth and fundamental programming abilities. Work obligations of a CCNA ensured Network faculty are to introduce, oversee and bolster IT systems and PC frameworks with a powerful work process. They are additionally in charge of execution and support of system equipment and programming alongside investigate system issues, system security certification, accessibility and routine models.

As of now there are ten unique tracks in the Associate level taking into account the diverse innovations. Be that as it may, the CCNA Routing and Switching is still the most significant and it is an essential in the event that you might want to represent considerable authority in Voice, Video, Security or something else from the accessible Associate-level accreditations. The Routing and Switching track is isolated in two stages - ICND1 and ICND2, which are two littler exams. Be that as it may, the last result is equivalent to the understood CCNA accreditation which you will win on the off chance that you effectively pass the 200-120 exam.

The CCxP projects are a the accompanying coherent stride in your vocation. They will set you up to comprehend and extensively handle the internetworking issues. You will encounter a gigantic transformation, greatly expanding your insight and aptitudes through the way toward acquiring these confirmations. Prior to that you will need to picked the range where you might want to burrow more. A portion of the understood points are Routing and Switching, Security and Collaboration (Voice and Video). This is the reason here you can locate the full Implementing Cisco Collaboration Devices (CICD) preparing and after that you can apply for your CICD (210-060) exam which will distinguish your aptitudes and learning with the Cisco Unified Communications items. Alternately, in the event that you are no less than a smidgen distrustful, you can pick the Implementing Cisco IOS Network Security (IINS) course and afterward pass the IINS (640-554) test.

Your last stride is to get your Cisco Certified Internetwork Expert (CCIE). Cisco prescribes three to five years of employment experience for those looking for their CCIE. Subsequent to hopping that obstacle, you then need to pass the composed CCIE Qualification Exam before taking the genuine lab. It is far until then however recall that each adventure is beginning with one single stride which for your situation ought to be your CCNA accreditation.

The part of a CCNA affirmed system work force is vital to enhance existing frameworks with a financially savvy technique and expanded efficiency. Since IT is a constantly changing industry which continues developing new advancements, CCNA is recorded as the highest affirmation that is advancing organizations and associations to put immense assets.

CCNA Terminology

CCNA CCNP Online Training offer suite of CISCO Certification training Online courses covering some of the most sort after technologies in Cisco. We currently cover Cisco Design, Cisco Network Security, Cisco Routing & Switching, Cisco Voice and Cisco Wireless. Whether you are looking at starting or furthering your career in Cisco or exploring opportunities to up-skill your team as a business, ccna online training courses and CISCO certification training program is ideally designed for you. Our Learning Consultants are always happy to guide you should you need advice or support in selecting the right course for you or your team.

abstract syntax (abstract syntax)

A description of a data structure that is independent of machine-oriented structures and encodings. 

ARPANET (Abstract Syntax Notation One)

A packet switched network developed in the early 1970s. The "grandfather" of today's Internet. ARPANET was decommissioned in June 1990. 

ACL (Access Control List)

A set of rules that determine which packets of information to pass and which to block depending on their source / destination address or port number.\r\n 

(Access Layer)

Part of Cisco's hierarchical model, which consists of three layers. This is the lowest layer which provides users access to the network. 

address mask (address mask)

A bit mask used to select bits from an Internet address for subnet addressing. The mask is 32 bits long and selects the network portion of the Internet address and one or more bits of the local portion. Sometimes called subnet mask. 

address resolution (address resolution)

A means for mapping Network Layer addresses onto media-specific addresses. See ARP. 

Application Layer (Address Resolution Protocol)

The top-most layer in the OSI Reference Model providing such communication services as electronic mail and file transfer. 

ADMD (Administration Management Domain)

An X.400 Message Handling System public service carrier. Examples: MCImail and ATTmail in the U.S., British Telecom Gold400mail in the U.K. The ADMDs in all countries worldwide together provide the X.400 backbone. See PRMD. 

ARPA (Advanced Research Projects Agency)

Now called DARPA, the U.S. government agency that funded the ARPANET. 

agent (agent)

In the client-server model, the part of the system that performs information preparation and exchange on behalf of a client or server application. See NMS, DUA, MTA. 

ANSI (American National Standards Institute)

The U.S. standardization body. ANSI is a member of the International Organization for Standardization (ISO) 

API (Application Program Interface)

A set of calling conventions defining how a service is invoked through a software package.

ARP (ARP)

The Internet protocol used to dynamically map Internet addresses to physical (hardware) addresses on local area networks. Limited to networks that support hardware broadcast. 

AOW (Asia and Oceania Workshop)

One of the three regional OSI Implementors Workshops, equivalent to OIW and EWOS.

ASN.1 (ASN.1)

The OSI language for describing abstract syntax. See BER.

ACSE (Association Control Service Element)

The method used in OSI for establishing a call between two applications. Checks the identities and contexts of the application entities, and could apply an authentication security check.

attribute (attribute)

The form of information items provided by the X.500 Directory Service. The directory information base consists of entries, each containing one or more attributes. Each attribute consists of a type identifier together with one or more values. Each directory Read operation can retrieve some or all attributes from a designated entry. 

Autonomous System (Autonomous System)

Internet (TCP/IP) terminology for a collection of gateways (routers) that fall under one administrative entity and cooperate using a common Interior Gateway Protocol (IGP). See subnetwork. 

which is better CCNA or MCITP???

Most critical to note about both of these confirmations is that you're relied upon to as of now have capability in the territories of study they speak to before you endeavor to ensure. They archive your insight into unfathomably diverse innovations, so relying upon what you as of now know about, you'll need to choose in like manner while developing your affirmation arrangement.

A MCITP (Microsoft Certified Information Technology Professional) concentrates on any of a few Microsoft server frameworks advancements, and records learning of those items and their application in a business IT environment. The passage level MCITP concentrates on Windows Server and Active Directory (and related, generally introduced instruments,) however there are a few MCITP alternatives (and developing routinely) that incorporate Exchange Server, SQL Server, and Sharepoint, to give some examples. The trouble of these exams fluctuates broadly, and your genuine learning of the items will likewise assume a part in how troublesome you see these exams to be. All in all, the more experience you have with the real item the less demanding they will appear.

CCNA (Cisco Certified Network Associate) concentrates on systems administration ideas like OSI model, subnet math, Ethernet exchanging, directing, and a fundamental prologue to steering conventions and would be fitting for a system administrator with a few years of experience who needed to exhibit capability in those ranges. Moderately as of late, numerous new CCNA choices have been included, with the "work of art" CCNA having been renamed to "CCNA: Routing and Switching." There are additionally security and voice CCNA alternatives, which, clearly, concentrate on system security and IP telephony. Which CCNA (or CCNAs, in the event that you choose to get a few) you secure ought to be founded on what you know and what you're keen on. Like the Microsoft exams, any of the CCNAs require involvement with the item, and for this situation, I'd prescribe broad involvement with the items, and an all encompassing information of subnet math before endeavoring any of them. The greater part of the Cisco exams accept the understudy can do subnets (i.e. twofold math) in their heads or with constrained note-space, and will make inquiries that you can't in any way, shape or form answer effectively (without speculating) in the event that you don't know how to compute subnets in relative short request.

Whichever you seek after, ensure you have entry to a sufficient lab, have the official educational modules for the exam, and a decent study manual for work through. Rehearse tests are accessible from various merchants (simply google CCNA hone exam to understand,) and are exceptionally useful in figuring out whether you're prepared for the exam or not

CCNA Interview questions part 4

CCNA Interview Questions

• How many updates must be missed before a route entry will be marked as unreachable?

Answer: A route entry is marked as unreachable if six updates are missed.

• What is the purpose of the garbage collection timer?

Answer: The garbage collection timer, or flush timer, is set when a route is declared unreachable. When the timer expires, the route is flushed from the route table. This process allows an unreachable route to remain in the routing table long enough for neighbors to be notified of its status.

• Why is a random timer associated with triggered updates? What is the range of this timer?

Answer: The random timer, whose range is 1 to 5 seconds, prevents a “storm” of triggered updates during a topology change.

• What is the difference between a RIP Request message and a RIP Response message?

Answer: A Request message asks a router for an update. A Response message is an update.

• Which two types of Request messages does RIP use?

Answer: A Request message may either ask for a full update or in some special cases it may ask for specific routes.

• Under what circumstances will a RIP response be sent?

Answer: A Response is sent when the update timer expires, or upon reception of a Request message.

• Why does RIP hide subnets at major network boundaries?

Answer: RIP updates do not include the subnet mask of the destination address, so a RIP router depends on the subnet masks of its own interfaces to determine how an attached major network address is subnetted. If a router does not have an attachment to a particular major network address, it has no way to know how that major network is subnetted. Therefore, no subnets of a major network address can be advertised into another major network.

• Which UDP port number is used to access IGRP?

Answer: IGRP does not use a UDP port. It is accessed directly from the network layer, as protocol number 9.

• What is the maximum IGRP internetwork diameter, in hops?

Answer: The maximum IGRP network diameter is 255 hops.

Benefits of Getting CCNA Certification

10 Advantages/Benefits of Getting CCNA Certification 

CCNA is a standout amongst the most vouched and esteemed IT confirmation all through the world. As much as or significantly more than 1 million CCNA declarations have been recompensed since it was initially propelled in 1998. So it is not by fluke that Cisco has accomplished such humongous figures.

Cisco confirmations have profited both the worker and also the business. Many individuals have truly changed their lives and have genuine advantages and obtained important abilities during the time spent getting to be confirmed. There are countless occasions where people having over ten years or so in their systems administration profession feel the need of getting CCNA affirmed

A youthful fellow hoping to enter the field of PC systems administration ought to consider the confirmation procedure important. Better believe it, definitely I realize that possibly you would have a five star or refinement of imprints in your graduation, however now it is not adequate to manage and progress in the constantly changing headways in the IT stadium.

It is ideal to be confirmed and do organizing, rather until one day you wind up not-working.

Here is the rundown of ten points of interest of getting CCNA ensured.

Advantages of CCNA Certification

1) Knowledge

During the time spent getting your CCNA affirmation you are certain to expand your insight and comprehension of the ideas. Regardless of the possibility that you have forever and a day of involvement in the field, you would build your insight and aptitudes.

As is commonly said, nothing can supplant certifiable experience, yet books are likewise similarly vital for staying up with the latest with the new headways in the business. During the time spent getting affirmed you would be barraged with numerous progressions of the business accordingly expanding your general learning.

2) Alphabets behind your name

In the wake of getting guaranteed, you would have the capacity to compose those four supernatural letters which positively do make a difference in nowadays.

So from the day you get confirmed till the following three years you would be legitimately and morally right to utilize CCNA in your resume and in addition in your business card. Aside from this you will get a CCNA card, testament and letter from Cisco accepting your accomplishment.

3) Career Advancements

CCNA Certification builds your odds of advancement. You could hope to climb in the progression of your association.

4) Salary Increment

Your next compensation addition could be practically around the bend in the wake of getting your accreditation. One of my companion got as much as 100% expansion in his compensation subsequent to getting his accreditation. You would tell that 100% expansion is simply unbelievable, yes it is conceivable, on the off chance that you have great reputation and will switch occupations.

PayScale - Salary Search: CCNA Certification

5) Stepping stone for some different affirmations

CCNA declaration is an essential for some other Cisco affirmation. CCNA fixation like CCNA Voice, CCNA Security, CCNA Wireless and numerous other expert level confirmations require a legitimate CCNA declaration. Additionally a portion of the universities give as much as 6 credits on the off chance that you hold a substantial CCNA testament and need to do more elevated amount considers.

6) Respect

Getting a CCNA declarations summons a specific measure of admiration from your partners and business. Some of your associates would have additionally attempted to get ensured, however couldn't get confirmed. In this way, this accomplishment of yours merits a back-tapping.

7) Employer advantages

Numerous businesses like to utilize guaranteed individuals since it requests a well remaining in the always expanding and aggressive IT field. That is the reason numerous businesses bear the expense of affirmation. It's a sort of shared give and take.

8) Kick-begin your Networking profession

Before getting CCNA affirmed, I used to think as to which choice would be better i,e. Cisco or Microsoft. Presently, I am sure that Cisco is the better choice as the last does not needs any broad planning. I could now get other desktop and Server level Microsoft affirmations all the while.

9) On track

In the wake of getting affirmed you would be in good shape to go for some other expert level accreditations. Getting the principal confirmation is constantly hard yet once you make the main stride, the adventure to the thousand miles in any event begins.

10) Personal Satisfaction

You generally needed to get affirmed, so after you get your confirmation letter and other stuff, a feeling of individual fulfillment, satisfaction, and help is felt.

CCNA Interview Questions part-3

CCNA CCNP are the certifications given by the CISCO company in the level of skillset in the Networking modules. CCNA CCNP online training is the leading online training provider for the students all over the countries in the world. Here the training is provided by the trainers who has 12+ years of experience in the Real time. Below are the CCNA CCNP interview questions which help you to attend CCNA interview or cisco certification exams.

What is the counting-to-infinity problem, and how can it be controlled?

Answer: Counting to infinity occurs when routes update a route over a loop; each router increases the metric of the route until the metric reaches infinity. The effects of counting to infinity are controlled by defining infinity as a fairly low metric so that infinity is reached fairly quickly and the route is declared unreachable.

What are hold down timers, and how do they work?

Answer: Hold down timers help prevent routing loops. If a route is declared unreachable or if the metric increases beyond a certain threshold, a router will not accept any other information about that route until the hold down timer expires. This approach prevents the router from accepting possibly bad routing information while the inter network is re converging.

What are the differences between distance vector and link state routing protocols?

Answer: A distance vector router sends its entire route table, but it only sends the table to directly connected neighbors. A link state router sends only information about its directly connected links, but it floods the information throughout the inter networking area. Distance vector protocols usually use a variant of the Bellman-Ford algorithm to calculate routes, and link state protocols usually use a variant of the Dijkstra algorithm to calculate routes.

What is the purpose of a topological database?

Answer: A topological database holds the link state information originated by all routers in the link state routing domain.

Explain the basic steps involved in converging a link state inter network.

Answer: Each router floods a link state information advertisement describing its links, the states of its links, and any neighboring routers connected to those links, throughout the inter networking area. All routers store all received copies of the link state advertisement in a link state database. Each router calculates a shortest path tree from the information in the topological database and enters routes in its routing tables based on the shortest path tree.

Why are sequence numbers important in link state protocols?

Answer: Sequence numbers help a router differentiate between multiple copies of the same link state advertisement and also prevent flooded link state advertisements from circulating endlessly throughout the inter network.

What purpose does aging serve in a link state protocol?

A: Aging prevents old, possibly obsolete, link state information from residing in a topological database or from being accepted by a router.

Explain how an SPF algorithm works?

Answer: A router builds a shortest path tree by first adding itself as the root. Using the information in the topological database, the router creates a list of all of its directly connected neighbors. The lowest cost link to a neighbor becomes a branch of the tree, and that router’s neighbors are added to the list. The list is checked for duplicate paths, and if they exist, the higher-cost paths are removed from the list. The lowest-cost router on the list is added to the tree, that router’s neighbors are added to the list, and the list is again checked for duplicate paths. This process continues until no routers remain on the list.

How do areas benefit a link state inter network?

Answer: Within a routing domain, areas are subdomains. They make link state routing more efficient by limiting the size of the link state database of each router in the area.

What is an autonomous system?

Answer: Depending on the usage, an autonomous system can be defined as an inter network under a common administrative domain or a single routing domain.

What is the difference between an IGP and an EGP?

Answer: An Interior Gateway Protocol is a routing protocol that routes within an autonomous system. An Exterior Gateway Protocol is a routing protocol that routes between autonomous systems.

What port does RIP use?

Answer: RIP uses UDP port 520.

What metric does RIP use? How is the metric used to indicate an unreachable network?

Answer: RIP uses a hop count metric. An unreachable network is indicated by setting the hop count to 16, which RIP interprets as an infinite distance.

What is the update period for RIP?

Answer: RIP sends periodic updates every 30 seconds minus a small random variable to prevent the updates of neighboring routers from becoming synchronized.

How many updates must be missed before a route entry will be marked as unreachable?

Answer: A route entry is marked as unreachable if six updates are missed.

What is the purpose of the garbage collection timer?

Answer: The garbage collection timer, or flush timer, is set when a route is declared unreachable. When the timer expires, the route is flushed from the route table. This process allows an unreachable route to remain in the routing table long enough for neighbors to be notified of its status.

Why is a random timer associated with triggered updates? What is the range of this timer?

Answer: The random timer, whose range is 1 to 5 seconds, prevents a “storm” of triggered updates during a topology change.

Here are the CCNA interview Questions part-1

                       CCNA interview Questions Part-2

CCNA Interview questions part-2

CCNA CCNP Online Training is an Associate level Cisco certification. It is the foundation for CCNP online Training as well as other higher CCIP and CCVP Certifications. CCNA Online Training and CCNP Online Training is Leading provider of online training in all CISCO Certification Training platforms. CCNA CCNP Online Training is in the IT industry for over some years providing CISCO online training,  job support, consulting and corporate training. Unlike other companies, training is our main business and our 100% efforts are put into providing training that beats our competition and offer you Cost effective Quality training

• What are the four different Ethernet encapsulation types?

Answer: From the Cisco IPX encapsulation command they are ARPA, NOVEL-ETHER, SAP and SNAP

• What are the three main tasks of a transparent bridge?

Answer: Learning, Forwarding, Filtering

•  What type of routing protocol is EIGRP?

Answer: Hybrid

• While troubleshooting a connectivity problem on the network, you issue the ping command from your PC command prompt, but the output shows “request times out.” At which OSI layer is this problem associated with?

Answer: The Network Layer

• What algorithm does OSPF use to compute its route table?

Answer: OSPF uses the shortest path first (SPF) algorithm, which is also known as the Dijkstra algorithm.

•  What is a stub area?

Answer: A stub area is an area that does not accept routing updates from outside its autonomous system.

• What does the TTL field of an IP packet header do?

Answer: The TTL field indicates the maximum time that a packet can be on the network. Each router that processes this packet decrements the TTL value by 1. If the value reaches zero, the packet is discarded from the network. The purpose of this field is to eliminate the possibility of a packet endlessly traversing the network.

• What is the primary purpose of a LAN?

Answer: The primary purpose of a local-area network is to allow resource sharing. The resources may be devices, applications, or information. Examples of shared resources are files, databases, e-mail, modems, and printers.

• What is a protocol?

Answer: A protocol is an agreed-upon set of rules. In data communications, the rules usually govern a

procedure or a format.

• What is the purpose of a MAC protocol?

Answer: A Media Access Control protocol defines how a given LAN medium is shared, how LAN devices

connected to the medium are identified, and how frames transmitted onto the medium are

• What is a frame?

Answer: A frame is a digital “envelope” that provides the information necessary for the delivery of data across a data link. Typical components of a frame are identifiers (addresses) of the source and destination devices on the data link, an indicator of the type of data enclosed in the frame, anderor-checking information.

• What feature is common to all frame types?

Answer: A feature common to all frame types is a format for identifying devices on the data link.

• What is a MAC address or MAC identifier?

Answer: A Media Access Control address or identifier is a means by which individual devices connected to a data link are uniquely identified for the purpose of delivering data.

• Why is a MAC address not a true address?

Answer: An address specifies a location. A MAC address is not a true address because it is permanently associated with the interface of a specific device and moves whenever the device moves. A MAC identifies the device, not the location of the device.

• What are the three sources of signal degradation on a data link?

Answer: The three sources of signal degradation on a data link are attenuation, interference, and distortion. Attenuation is a function of the resistance of the medium. Interference is a function of noise entering the medium. Distortion is a function of the reactive characteristics of the medium, which react differently to different frequency components of the signal.

Here in this blog last time we have presented the CCNA interview Questions part-1
                                                                        CCNA interview Questions part-3

CCNA Interview Question Part-1

CCNA CCNP Online Training offer suite of CISCO Certification preparing Online courses covering the absolute most sort after advancements in Cisco. We right now cover Cisco Design, Cisco Network Security, Cisco Routing and Switching, Cisco Voice and Cisco Wireless. Whether you are taking a gander at beginning or assisting your profession in Cisco or investigating chances to up-aptitude your group as a business, ccna web instructional classes and CISCO confirmation preparing project is in a perfect world intended for you. Our Learning Consultants are constantly upbeat to guide you if you require counsel or backing in selecting the right course for you or your group.

CCNA CCNP Interview Questions:

• Which layer of the OSI model is responsible for reliable connections?

Answer: The Transport layer of the OSI model is responsible for reliable connections.

• What is the difference between acknowledgments and handshaking?

Answer: Handshaking is used to negotiate the properties of a connection that is being established. Acknowledgments are used to tell the sender that data has been successfully received by the destination during the use of a connection.

•  How many VTP modes are there and what are they?

Answer: Three: Server, Client, and Transparent

• What are the two types of Trunk encapsulation protocols?

Answer: IEEE 802.1Q and Cisco’s ISL

• What are the four primary no routable protocols?

Answer: SNA, NetBIOS, DEC LAT, DEC MOP

• What is the difference between TCP and UDP?

Answer: The primary difference between TCP and UDP is that TCP is a connection oriented protocol and UDP is a connection less protocol.

• What is HSRP?

Answer: HSRP, or the Hot Standby Routing Protocol, is a Cisco proprietary protocol that brings routing functionality to end devices that would otherwise not be capable of taking advantage of redundant network connections. HSRP enables a pair of Cisco routers to work together to present the appearance of a single virtual default-gateway to end devices on a LAN segment.

• What is the difference between a Public IP address and a Private IP address?

Answer: Public address space is a unique address that is assigned to a company. Private address space is not recognized by the Internet and can be used by anyone within their private network.

•  What does AAA stand for?

Answer: Authentication, authorization, and accounting

•  The H.323 protocol is used for what?

Answer: H.323 is used for multi service (multimedia) applications, usually in a Voice Over IP environment.

•  What type of routing protocol maintains neighbors?

Answer- Link State

• what is the range of values for administrative distance?

Answer: 0-255

•  Describe the difference between uni cast, multi cast, and broadcast traffic?

Answer: Unicast traffic flows from a single source to a single destination MAC address. Multicast traffic flows from a single source MAC address to many destinations and uses a functional MAC address. Broadcast traffic is from a single source to all devices on the Ethernet segment. This is specified by a destination MAC address of all ones.

For More visit the below posts    
CCNA interview Questions part-2
CCNA interview Questions part-3

MCITP and MCSE exam Requirements

Many of the Freshers and IT professionals are still confused about on which the Windows server certification they should work upon. which is valuable and which one will leads to a god job. which one should be taken whether the MCSE or new MCITP????

These are the questions that most of the people come across. You have to think about one thing that the Persons job factor does not depend upon the only onecertification. Its good to take some good descision even though it takes some time. Just analyse the current situation of yours and the technological world nad make a step in. MCITP Online training is available for all students all around the world.

Questions you should Analyse???

Server 2003 will work for long?
so that are you going to involve in serever 2008 Migration?
upto howlong i will serve for my company?
does i need a New job?
Am trying to change my career?

Windows Server 2003

MCSA Exam Requirements

To become MCSA certified you are required to pass the following exams:

Exam 70-290 - Managing and Maintaining a Windows Server 2003 Environment
Exam 70-291 - Implementing, Managing, and Maintaining a Windows Server 2003 Network Infrastructure
And one of these two elective exams:

Exam 70-620 - TS: Configuring Microsoft Windows Vista Client
Exam 70-270 - Installing, Configuring, and Administering Windows XP Professional

MCSE Exam Requirements

Once you get your MCSA you will only need to pass the following 3 exams to become MCSE Certified:

Exam 70-293 - Planning and Maintaining a Windows Server 2003 Network Infrastructure
Exam 70-294 - Planning, Implementing, and Maintaining a Windows Server 2003 Active Directory Infrastructure
And one of these two:

Exam 70-297 - Designing a Windows Server 2003 Active Directory and Network Infrastructure
Exam 70-298 - Designing Security for a Windows Server 2003 Network
For more information on the MCSE requirements, exams and their objectives, check out this page.

MCITP Exam Requirements

Well first let me mention that there are two MCITP certifications for Windows Server 2008: MCITP: Server Administrator and MCITP: Enterprise Administrator.

For the MCITP Server Administrator Certification you will need to pass:

Exam 70-640 - TS: Windows Server 2008 Active Directory, Configuring
Exam 70-642 - TS: Windows Server 2008 Network Infrastructure, Configuring
Exam 70-646 - Pro: Windows Server 2008, Server Administrator
For the MCITP Enterprise Administrator Certification you will need to pass:

Exam 70-640 - TS: Windows Server 2008 Active Directory, Configuring
Exam 70-642 - TS: Windows Server 2008 Network Infrastructure, Configuring
Exam 70-643 - TS: Windows Server 2008 Applications Infrastructure, Configuring
Plus one of these:

Exam 70-620 - TS: Configuring Microsoft Windows Vista Client
Exam 70-624 - TS: Deploying and Maintaining Windows Vista Client and 2007 Microsoft Office System Desktops
And the final exam:

Exam 70-647 - Pro: Windows Server 2008, Enterprise Administrator

MCSE & MCITP

There are advantages to going this route -- you earn your MCSE on Server 2003 and then take the additional upgrade exams to earn your MCITP on Server 2008.

The upgrade paths are an awesome shortcut. With an MCSE on Server 2003 (sorry Server 2000 doesn't qualify for this upgrade) you can earn 3 MCTS certifications by passing a single upgrade exam:

Exam 70-649 - TS: Upgrading Your MCSE on Windows Server 2003 to Windows Server 2008, Technology Specialist.
After that you need only one exam to earn your MCITP Server Admin:

Exam 70-646 - PRO: Windows Server 2008, Server Administrator
Or two exams to earn your MCITP Enterprise Admin:

Exam 70-620 - TS: Configuring Windows Vista Client
or

Exam 70-624 - TS: Deploying and Maintaining Windows Vista Client and 2007 Microsoft Office System Desktops
and

Exam 70-647 - PRO: Windows Server 2008, Enterprise Administrator