Cisco BGP Configuring BGP on Cisco Routers Set 2

1.

Because of large BGP tables being received from your ISP Certkiller , you must filter any possible addresses that are within the private IP (RFC 1918) address space. Which prefix lists would filter any of these private addresses?

ip prefix-list Certkiller seq 5 deny 192.168.0.0/16 le 32 ip prefix-list Certkiller seq 10 deny 172.16.0.0/12 le
32 ip prefix-list Certkiller seq 15 deny 10.0.0.0/8 le 32 ip prefix-list Certkiller seq 5 deny 192.168.0.0/16 ge 16 ip prefix-list Certkiller seq 10 deny 172.16.0.0/12 ge24 ip prefix-list Certkiller seq 15 deny 10.0.0.0/8 ge 8 ip prefix-list Certkiller seq 5 deny 192.168.0.0/16 ip prefix-list Certkiller seq 10 deny 172.16.0.0/12 ip prefix-list Certkiller seq 15 deny 10.0.0.0/16 ip prefix-list Certkiller seq 5 deny 192.168.0.0/16 ip prefix-list Certkiller seq 10 deny 172.16.0.0/12 ip prefix-list Certkiller seq 15 deny 10.0.0.0/32

2.

Which two of the following are true regarding the BGP Prefix-Based outbound route filtering feature? (Choose two.)

IP multicast routes are not supported. Outbound route filtering is configured only on a per-address family basis. Outbound route filtering can be configured for either iBGP or eBGP sessions. The outbound route filter can be defined in a Prefix list, Distribute list or Access lists. Outbound route filtering is more effective when a distance vector IGP is used.

3.

Which configuration will enable the CK1 router in the AS51003 sub-AS (member-AS) as a route reflector with neighbors 10.1.1.1 and 10.2.2.2 as its route-reflector clients?

!
CK1 router bgp 51003
bgp confederation identifier 55111
bgp confederation peers 51001 51002
neighbor 10.1.1.1 remote-as 51003
neighbor 10.2.2.2 remote-as 51003
neighbor 10.1.1.1 route-reflector-client
neighbor 10.2.2.2 route-reflector-client !CK1 router bgp 51003
bgp confederation identifier 55111
bgp confederation peers 51001 51002
neighbor 10.1.1.1 remote-as 51001
neighbor 10.2.2.2 remote-as 51002
neighbor 10.1.1.1 route-reflector-client
neighbor 10.2.2.2 route-reflector-client !CK1 router bgp 55111
bgp confederation identifier 51003
neighbor 10.1.1.1 remote-as 51003
neighbor 10.2.2.2 remote-as 51003
neighbor 10.1.1.1 route-reflector-client
neighbor 10.2.2.2 route-reflector-client !CK1 router bgp 55111
bgp confederation identifier 51003
neighbor 10.1.1.1 remote-as 55111
neighbor 10.2.2.2 remote-as 55111
neighbor 10.1.1.1 route-reflector-client
neighbor 10.2.2.2 route-reflector-client

4.

Which BGP configuration option is designed to reduce router processing load caused by unstable routes?

neighbor {ip-address} maximum-prefix {number} bgp dampening no sync bgp deterministic-med sync

5.

How can you prevent multihomed customers with connections to two service providers from acting as a transit AS?

Enable BGP synchronization on all the customer routers. Use MED to influence the inbound traffic from the ISPs. Use static routing to the ISPs. Use an AS-path access-list to filter the BGP updates to the ISPs. Use conditional advertisements when sending BGP updates to the ISPs.

6.

Which of these situations best describe when to use the AS number translation feature?

All single-homed customers are using public AS numbers. All single-homed customers are using private AS numbers. All multihomed customers are using public AS numbers. All multihomed customers are assigned different AS numbers from different ISPs.

7.

The neighbor {ip-address} maximum-prefix {maximum number} command prevents which router condition?

frequent BGP session resets routing instability asymmetric routing CPU and memory exhaustion route flaps

8.

Why can using the ip tcp path-mtu-discovery command improve BGP convergence?

Single packet sizes in TCP sessions are limited. Smaller MSS sizes may reduce BGP convergence times. BGP is allowed to use a larger TCP window size. BGP is enabled to fragment its large update packets. The BGP memory requirements on routers are reduced.

9.

What state will a BGP session move to immediately after the router sends a BGP Open message to its neighbor?

active OpenConfirm OpenSent established idle

10.

What is a key benefit of implementing the bgp dmzlink-bw command?

establishes a secure BGP link between eBGP and iBGP peers enables the unequal cost path load balancing feature for external BGP links allows BGP to use link bandwidth as a metric when computing best route selection increases BGP security by dynamically allocating community strings to eBGP routes

Cisco BGP Configuring BGP on Cisco Routers Set 2

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Cisco BGP Configuring BGP on Cisco Routers Set 2

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