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Categories >> Certifications >> Cisco Certifications >> CCNA


 CCNA interview questions  CCNA Interview Questions (1882)
 CCDA interview questions  CCDA Interview Questions (88)
What is BGP attribute & How many types of attributes are
used by BGP???
 Question Submitted By :: Shahin
I also faced this Question!!     Rank Answer Posted By  
  Re: What is BGP attribute & How many types of attributes are used by BGP???
# 1
BGP attributes is a metric used to describe the
characteristics of a BGP paths. Attributes are conatained in
update messages passed between BGP peers for advertise routers.

BGP attributes are broadly divided into two types -

a) Well Known
b) Optional.

Well Known attributes are divided into two types -

a) Mandatory
b) Descretionary

** Mandatory attributes are divided into three types -

a) AS Path
b) Next Hop
c) Origin

** Origin attributes divided into three types -

a) Internal(i)
b) External(e)
c) Incomplete(?)

** Descretionary attributes are divided into two types -

a) Local Preference
b) Atomic Aggregate

Optional attributes are divided into two types -

a) Transitive
b) Non Transitive

** Transitive attributes are divided into two types -

a) Aggregator
b) Community

** Community attributes are divided into for types -

a) No-export
b) No advertise
c) Internet
d) Local AS.

&& Non transitive attributes are divided into three types -

a) MED (Multi Exit Discriminator).
b) Originator
d) Cluster ID.

I'll explain all attributes on next post..!!!
Is This Answer Correct ?    72 Yes 8 No
  Re: What is BGP attribute & How many types of attributes are used by BGP???
# 2
Lets start from first... I m gonna explain each attributes
one by one -

Well Known:
Well known attributes are must be recognized by
each compliant of BGP implementations. Well known attributes
are propagated to other neighbors also.

Optional attributes are recognized by some
implementation of BGP & expected that not recognized by
everyone. Optional attributes are propagated to their
neighbors based on the meanings.

Mandatory is BGP well known attributes. Mandatory
attributes are must be present in all update message passed
between BGP peers. It is present in route description.

Discretionary is BGP well known attributes.
Discretionary attributes are may be present on update message.

AS Path:
AS path is BGP well known mandatory attributes. AS
path defines the list of Autonomous System that a route has
passed through. AS path attributes are used in path
selection process & lowest path attributes will be preferred
over highest one.

Next hop is BGP well known mandatory attributes. In
BGP, next hop is the IP address which is used to reach the
advertising BGP router.

For EBGP, next hop is the ip address of the connection
between the peers.

For IBGP, EBGP next hop address is carried into local
autonomous system.

Origin is BGP well known mandatory attributes.
Origion attributes define how BGP router learned about the
particular route. Origin attribute have three possible
values i.e. internal (i), External (e) & Incomplete (?).

BGP learned about the route from Interior
routing protocol.

BGP learned about the router from External BGP.

The origin of the route is unknown or learned by
some other way. The origin of incomplete occurs when routes
are redistributed into BGP.

1. Due to lack of time, rest of attributes I'll discuss on
next post.
2. Its little bit difficult to draw diagram here & explain
each & every attributes.
3. If anyone need more about this, mail me on

Thanks & enjoys the weekend party tonight.... hehehe
Is This Answer Correct ?    53 Yes 4 No
  Re: What is BGP attribute & How many types of attributes are used by BGP???
# 3
BGP attributes are path manipulation features of BGP.There are
many attributes : AS-path, MED, Local preference, Weight, and
Origin code
Is This Answer Correct ?    38 Yes 4 No
  Re: What is BGP attribute & How many types of attributes are used by BGP???
# 4
Orgin Code (e) is not learnt via eBGP ( External BGP). it is
a protocol called External Gateway Protocol. This protocol
has been deprecated.


Srinath M
Is This Answer Correct ?    17 Yes 14 No
  Re: What is BGP attribute & How many types of attributes are used by BGP???
# 5 
Is This Answer Correct ?    1 Yes 0 No

Other CCNA Interview Questions
  Question Asked @ Answers
Identify the command that configures the bandwidth to 56K? A.) Router(config-if)# bandwidth 56000 B.) Router(config-if)# bandwidth 56k C.) Router(config)# bandwidth 56 D.) Router(config-if)# bandwidth 56   1
Identify the 3 guidelines for routers in the same autonomous system? A.) Must be configured for IGRP or RIP B.) Interconnected C.) Assigned the same autonomous system number D.) Configured for the same routing protocol E.) Must be same model of router   1
Identify the type of routing protocol that maintains a topological database of the network? A.) Topological state B.) Shortest Path First C.) Link state D.) Distance vector   1
Identify the order of the 5 step encapsulation? 1) Create the segment 2) Convert the frame to bits 3) Create the packet 4) Create the frame 5) User creates the data A.) 1,2,4,2,5 B.) 2,1,3,4,5 C.) 5,1,3,4,2 D.) 5,3,4,1,2   1
Identify the command to reload the router? A.) Router(config)# reload B.) Router# reset C.) Router# reload D.) Router> reload   1
Novell IPX network addresses have two conferrable parts. The network administrator specifies the IPX network number. How is the node number determined? A. It is the serial number of the given device B. It is assigned as a lease by Novell DHCP C. It is also set by the network administrator D. It is usually the MAC address of one Interface E. It is downloaded by Netware Core Protocol (NCP)   1
Identify 2 reasons for disabling CDP? A.) If the router is not configured for RIP B.) Save bandwidth by eliminating overhead C.) If the router is configured for Appletalk D.) When connected to a non-Cisco router   1
Identify the 2 commands that copies the configuration in NVRAM to RAM? A.) copy backup-config running-config B.) configure nvram C.) copy startup-config running-config D.) configure memory   3
CPE is an acronym for which of the following? A.) Customer Premise Equipment B.) Central Processing Engineering C.) Customer Process Equipment D.) Central Processing Equipment   1
here is your question sahin Hi Jitendera, If i m not wrong, then in EIGRP, Metric weight is set to K1(Bandwidth)=1, K2(Delay)=0, K3(Reliability)=1, K4(Load)=0, K5(MTU)=0. This is default setting for EIGRP. I knew about it from ICND 2 cisco press book. Three more questions - a) If we change the K value (I mean metric weight)on a router what will happen??? b) When redistribution is necessary in EIGRP. Is there any condition for that??? c) What is reference bandwidth for metric calculation in EIGRP. As we know, in OSPF, on a CISCO router reference bandwidth is 10Mbps.   3
Identify 2 features of PPP CHAP authentication? A.) Username and password is sent in clear text B.) Authentication messages are sent periodically during the connection C.) Less secure then PAP D.) Local router 'challenges' the remote router   1
Which of the following provide connection-oriented transport to upper layer protocols? A.) SPX B.) RIP C.) NLSP D.) NCP   1
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