Computer and Networking:troubleshooting the problems

Window 7 features and minimum Hardware Requirements

2010-07-07T19:16:00.000+05:30

1) DirectAccess: Gives mobile users seamless access to corporate

     networks without a need to VPN.
2) BranchCache: Decreases the time branch office users spend waiting to
    download files across the network.

3) Federated Search: Find information in remote repositories, including
   SharePoint sites, and many others with a new simple user interface.

4) BitLocker and BitLocker To Go: Helps to protect data on PCs and
   removable drives, with manageability to enforce encryption and backup
   of recovery keys.
5) AppLocker: Specifies what software is allowed to run on a user's PCs
   through centrally managed but flexible Group Policies.

6)Virtual desktop infrastructure (VDI) optimizations: Gives the user the
    ability to reuse virtual hard drive (VHD) images to boot a physical PC.
7) Disk Imaging: Allows you to create a single OS image for deployment
    to users worldwide.
Hardware Requirements:
The hardware requirements for Windows 7 are relatively close to those for

Vista. This is an improvement. Speeds of processors and RAM have greatly
increased since Vista was released where the requirements have virtually stayed
the same. Windows 7 requirements:

1) GHz or faster 32-bit (x86) or a 64-bit (x64) processor

2) 1GB RAM (32-bit)/2 GB RAM (64-bit)

3) 16 GB available disk space (32-bit)/20 GB (64-bit)

4) DirectX 9 graphics processor with WDDM 1.0 or higher driver.

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2010-07-07T18:32:00.000+05:30

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The Industry's 10 Best IT Certifications

2010-07-02T16:30:00.000+05:30

The Industry's 10 Best IT Certifications

2009-12-01T01:31:00.001+05:30

EIGRP includes the following key features:

Fast convergence: A router running EIGRP stores all its neighbors’ routing tables so that it can quickly adapt to alternate routes if a preferred route disappears. If an appropriate route does not exist, EIGRP queries its neighbors to discover an alternate route. These queries propagate until an alternate route is found.

VLSM support: EIGRP is a classless routing protocol, which means that it advertises a subnet mask for each destination network. Support for VLSM allows for different subnetmasks within the same network and support for non-contiguous subnetworks. EIGRP routes are automatically summarized at the major network number boundary. However, EIGRP can be configured to summarize on any bit boundary on any router interface.

Partial updates: EIGRP does not send periodic updates. Instead, it sends partial triggered updates. The updates are sent only when the path or the metric changes for a route, and they contain only information about the changed routes. Propagation of partial updates is automatically bounded so that only those routers that need the information are updated. Partial updates are handled by using multicast and unicast packets instead of broadcast packets. As a result, EIGRP consumes significantly less bandwidth than IGRP. This behavior is different than link-state protocols, in which an update is transmitted to all link-state routers within an area.

Multiple network-layer protocol support: EIGRP supports IP, AppleTalk, and Novell NetWare IPX through the use of protocol-dependent modules. These modules are responsible for protocol requirements specific to the network layer. The rapid convergence and sophisticated metric structure of EIGRP offers superior performance and stability when implemented in IPX and AppleTalk network

Other EIGRP features include the following:

Seamless connectivity across all data link layer protocols and topologies: EIGRP does not require special configuration to work across any Layer 2 protocols. Other routing protocols, such as OSPF, use different configurations for different Layer 2 protocols, such as Ethernet and Frame Relay. EIGRP operates effectively in both LAN and WAN environments. WAN support for dedicated point-to-point links and nonbroadcast multiaccess (NBMA) topologies is standard for EIGRP. EIGRP accommodates differences in media types and speed when neighbor adjacencies form across WAN links and can be configured to limit the amount of bandwidth that the protocol uses on WAN links.

Sophisticated metric: The EIGRP metric is based on bandwidth and delay. However, it can also be configured to consider reliability, load, and maximum transmission unit (MTU).

Multicast and unicast: To establish neighbor relationships, EIGRP uses multicast and unicast addressing rather than broadcast addressing to send and acknowledge routing updates. The EIGRP multicast address is 224.0.0.10. The use of multicast and unicast also helps reduce bandwidth requirements.

EIGRP BASICS

2009-11-30T19:54:00.000+05:30

You can create an EIGRP default route with the ip default-network network-number global configuration command. The configured router advertises the specified network listed as the gateway of last resort. Other routers use their next-hop address to the advertised network as their default route.

The network specified must be reachable by the router before it announces the network as a candidate default route to other EIGRP routers. The network must also be passed to other EIGRP routers so that those routers can use this network as their default network and gateway of last resort. Therefore, the network must be either an EIGRP-derived network in the routing table or generated using a static route that has been redistributed into EIGRP.
Multiple default networks can be configured. Downstream routers use the EIGRP metric to determine the best default route

cable type

2009-11-30T19:39:00.000+05:30

Cable Type               Bandwidth                    Maximum Length            Cost

CAT 5 UTP             10Mbps to 100Mbps         100 meters            Inexpensive

Thinnet                     10Mbps                             185 meters            Inexpensive

Thicknet                   10Mbps                             500 meters            Expensive

Fiber optic             100Mbps to 2Gbps+           2 kilometers            Expensive

cisco and microsoft exam

2009-11-25T23:56:00.000+05:30

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2009-11-25T02:27:00.000+05:30