Cisco BGP Configuring BGP on Cisco Routers Set 1

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Cisco BGP Configuring BGP on Cisco Routers Set 1

Besides BGP policy scaling and IBGP mesh scaling, service providers need to concentrate on controlling _______.

The AS-Path length by using AS-PATH prepending. ✘ The BGP query process by using route summarization. ✘ The number of routes being redistributed from BGP into the IGP using route-maps. ✘ The number of routes being redistributed from the IGP into the BGP using route-maps. ✔ The number of BGP updates and the size of the BGP forwarding tables using route aggregation. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which condition must be met before Route Refresh messages can be sent to a BGP peer?

The soft reconfiguration feature must be enabled. ✘ The BGP peer must advertise Route Refresh capability. ✘ The Outbound Route Filter (ORF) feature must be enabled. ✘ The BGP peer must have enough memory to store a copy of the original update. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What type of BGP path attributes are propagated to BGP peers with the partial bit set even if they are not recognized?

Optional Transitive ✘ Well Known Mandatory ✘ Optional Non-Transitive ✘ Well Known Discretionary ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which four attributes are used by BGP to detect routing loops? (Choose four.)

AS.Path Cluster ID Cluster List Originator ID Community ID

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which BGP path attribute is only used within the local router and NOT shared between all the BGP routers within the AS?

MED ✘ Origin ✘ Weight ✘ Local Preference ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Complete the BGP configuration on Certkiller 1 so that the show ip bgp output reflects the following path selection?
Certkiller 1#show ip bgp
BGP table version is 9, local router ID is 172.16.10.1 Status codes: s suppressed, d damped, h history, *valid, >
best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 172.20.0.0 10.10.20.1 150 65123 65122 i
* 10.10.10.2 0 120 65122 i
*> 172.25.0.0 10.10.21.1 150 65123 65124 i
* 10.10.10.2 120 65122 65124 i
*> 172.30.0.0 10.10.21.1 0 150 65123 i
* 10.10.10.2 120 65122 65123 I
hostname Certkiller 1
!
router bgp 65121
neighbor 10.10.10.2 remote-as 65122
neighbor 10.10.20.1 remote-as 65123
________________________

neighbor 10.10.20.1 metric 0 ✘ neighbor 10.10.10.2 metric 0 ✘ neighbor 10.10.10.2 weight 120neighbor 10.10.20.1 weight 150 ✘ neighbor 10.10.10.2 local-preference 0neighbor 10.10.20.1 local-preference 100 ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What is the correct BGP configuration to have AS 65111 prefer the path to AS 65221 over the path to AS 65237 except for the traffic which originates in AS 65237?

router bgp 65111
neighbor 10.10.10.10 remote-as 65221
neighbor 10.20.20.20 remote-as 65237
neighbor 10.10.10.10 weight 160
neighbor 10.20.20.20 weight 150
neighbor 10.20.20.20 filter-list 1 weight 170
!
ip as-path access-list 1 permit _65237$ ✘ router bgp 65111neighbor 10.10.10.10 remote-as 65221
neighbor 10.20.20.20 remote-as 65237
neighbor 10.10.10.10 weight 160
neighbor 10.20.20.20 weight 150
neighbor 10.20.20.20 access-group 1 weight 170
!
access-list 1 permit _65237$ ✘ router bgp 65111neighbor 10.10.10.10 remote-as 65221
neighbor 10.20.20.20 remote-as 65237
neighbor 10.10.10.10 weight 160
neighbor 10.20.20.20 weight 150 ✘ router bgp 65111neighbor 10.10.10.10 remote-as 65221
neighbor 10.20.20.20 remote-as 65237
neighbor 10.10.10.10 weight 160
neighbor 10.20.20.20 weight 150
neighbor 10.20.20.20 route-map test
!
route-map test permit 10
match as-path _65221$ ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What are two methods used to configure the local-preference BGP path attribute on Cisco routers? (Choose two)

Using a route-map with the set local-preference value command. Using the bgp default local-preference value BGP configuration command. Using the default-metric local-preference value BGP configuration command. Using the neighbor ip-address local-preference value BGP configuration command.

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Given the following:
router bgp 65102
neighbor 10.1.1.1 remote-as 65103
neighbor 10.2.2.2 remote-as 65104
neighbor 172.16.1.4 remote-as 65102
neighbor 10.1.1.1 route-map setlp in
!
route-map setlp permit 10
match community 1
set local-preference 150
!
route-map setlp permit 20
!
ip community-list 1 permit 65103:150
What will the configuration on R1 accomplish?

Routes from AS 65103 marked with a Community of 65103: 150 will have the default Local Preference; all
other routes will have a Local Preference of 150 ✘ Routes from AS 65103 marked with a Community of 65103: 150 will have a Local Preference of 150; allother routes will have the default Local Preference. ✘ Routes from AS 65103 and AS 65104 marked with a Community of 65103: 150 will have the default LocalPreference; all other routes will have a Local Preference of 150. ✘ Routes from AS 65103 and AS 65104 marked with a Community of 65103: 150 will have a Local Preferenceof 150; all other routes will have the default Local Preference. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

10.

The purpose of the bgp always-compare-med command is to compare the MED ______.

Even if the routes originate in different ASs. ✘ Even if the routes originate from the same AS. ✘ Even if the routes have different AS-Path length. ✘ Last, after all other path attributes are compared. ✔ First, before any other path attributes are compared. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

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Cisco BGP Configuring BGP on Cisco Routers Set 1

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