Answer / jagadiesh

The Border Gateway Protocol (BGP) is the core routing
protocol of the Internet. It maintains a table of IP
networks or 'prefixes' which designate ...

he attributes that are commonly used in the Cisco
Implementation of BGP are as follows:

WELL-KNOWN, MANDATORY

AS-path: A list of the Autonomous Systems (AS) numbers that
a route passes through to reach the destination. As the
update passes through an AS the AS number is inserted at
the beginning of the list. The AS-path attribute has a
reverse-order list of AS passed through to get to the
destination.

Next-hop: The next-hop address that is used to reach the
destination.

Origin: Indicates how BGP learned a particular route. There
are three possible types -- IGP (route is internal to the
AS), EGP (learned via EBGP), or Incomplete (origin unknown
or learned in a different way).


WELL-KNOWN, DISCRETIONARY

Local Preference: Defines the preferred exit point from the
local AS for a specific route.

Atomic Aggregate: Set if a router advertises an aggregate
causes path attribute information to be lost.


OPTIONAL, TRANSITIVE

Aggregator: Specifies the router ID and AS of the router
that originated an aggregate prefix. Used in conjunction
with the atomic aggregate attribute.

Community: Used to group routes that share common
properties so that policies can be applied at the group
level.


OPTIONAL, NON-TRANSITIVE

Multi-exit-discriminator (MED): Indicates the preferred
path into an AS to external neighbors when multiple paths
exist.


A list of path attributes is contained in BGP update
messages. The attribute is variable length and consists of
three fields: Attribute type consisting of a 1-byte
attribute flags field and a 1-byte attribute code field,
Attribute length field that is 1 or 2 bytes, and a variable
length attribute value field. The attribute type codes used
by Cisco are: 1-origin, 2-AS-path, 3-Next-hop, 4-MED, 5-
Local preference, 6-Atomic aggregate, 7-aggregator, 8-
community, 9-originator-ID, and 10-cluster list.

This article discussed the BGP attributes with the intent
of preparing you for those confusing questions on the BSCN
or BSCI exams. Hopefully, there is no more confusion on the
various attributes that are used in the Cisco
implementation of BGP.

Answer / akash

Just want to add BGP is application oriented protocol and
In IGP there must be a fullmesh topology used to establish the connection.

Identify the command that configures serial0 for PPP encapsulation? A.) Router(config)# encapsulation ppp B.) Router(config-if)# encapsulation serial ppp C.) Router(config-if)# encapsulation ppp D.) Router# encapsulation ppp

2 Answers  

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What is the name of best path in eigrp protocol?

0 Answers  

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Which command will enable CHAP authentication on a serial interface that is using PPP? A.) encapsulation chap B.) ppp chap C.) ppp enable chap D.) ppp encapsulation chap E.) ppp authentication chap F.) ppp chap enable

2 Answers  

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What is the Network Layer of the OSI responsible for? A.) Bridging B.) Routing packets through an internetwork C.) Regenerating the digital signal D.) Gateway services

3 Answers  

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what is subnet mask?

5 Answers   HCL,

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You have typed "ping" 172.16.101.1 and get the following display: Type escape sequence to abort. Sending 5, 100-byte ICMP Echoes to 172.16.101.1, timeout is 2 seconds: .!!!! What does the "." signify? A. That one message timed out. B. That all messages were successful. C. That one message was successful. D. That one message completed in under the allotted timeframe.

1 Answers  

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Which command will display Ethernet 0's IP address? A.) display ip address e0 B.) show ip interface e0 C.) show address e0 D.) sh ip address e0 E.) show all

1 Answers  

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What is switch priority & why it is used????

5 Answers   ADP,

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there is three mode of vtp let there are three switch s1 in server mode s2 in transparent mede and s3 in clint mode then will that tranparnt mode going to effect the network if yes then how and if no then what it will do

2 Answers   IBM,

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When editing a line in the CLI mode, what does 'CTRL-A' do? A.) Moves you to the previous command. B.) Moves you to the next word. C.) Moves you to the end of the line. D.) Moves you to the next command. E.) Moves you to the beginning of the line.

1 Answers  

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What is the correct command line syntax for configuring a port on a 7000 or 7500 series Cisco router with a VIP card? A.) port B.) port adapter/port C.) You can't put a VIP card in a 7000 or 7500 router. D.) slot/port-adapter/port E.) slot/port F.) slot

1 Answers  

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You are given the following address: 15.16.193.6/21. Determine the subnet mask, address class, subnet address, and broadcast address. A. 255.255.248.0, A, 15.16.192.0, 15.16.199.255 B. 255.255.248.0, B, 15.16.192.0, 15.16.199.255 C. 255.255.248.0, A, 15.16.199.255, 14.15.192.0 D. 255.255.242.0, A, 15.16.192.0, 15.16.199.255

2 Answers  

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