QUESTION NO: 21
What is a key benefit of implementing the bgp dmzlink-bw command?
A. increases BGP security by dynamically allocating community strings to eBGP routes
B. establishes a secure BGP link between eBGP and iBGP peers
C. enables the unequal cost path load balancing feature for external BGP links
D. allows BGP to use link bandwidth as a metric when computing best route selection
Answer: C
QUESTION NO: 22
Refer to the exhibit. Service provider A (AS 123) has an EBGP session to the customer where the AS number 65053 is used at the customer end. Service provider B (AS 234) also has an EBGP session to the customer where the AS number 65286 is used at the customer end. The customer decides to use AS 65053 internally. All router BGP configuration lines have 65053 as the AS number. The customer uses AS number 65286 only when establishing the EBGP session to AS 234. In this case, which is the correct configuration?
A. The neighbor {ip-address} local-as {private-as} command is needed on the customer router that is connected to Service Provider B.
B. The neighbor {ip-address} local-as {private-as} command is needed on the Service Provider router in AS 123.
C. The neighbor {ip-address} local-as {private-as} command is needed on the Service Provider router in AS 234.
D. The neighbor {ip-address} local-as {private-as} command is needed on the customer router that is connected to Service Provider A.
Answer: A
QUESTION NO: 23
What is one method an ISP can use to reduce the BGP requirements within the ISP network core?
A. Use MPLS within the ISP network core.
B. Use MPLS to connect to multihomed customers.
C. Carry the external routes using an IGP like IS-IS.
D. Use recursive routing to reach the BGP next hop.
Answer: A
QUESTION NO: 24
What are two characteristics of BGP confederations? (Choose two.)
A. All routers within the BGP confederation must support BGP confederations.
B. An Intra-Confederation EBGP session behaves like an EBGP session when propagating routing updates.
C. The member AS numbers used within the confederation are visible from outside the confederation.
D. Intra-Confederation EBGP neighbors must be directly connected or ebgp-multihop must be configured.
Answer: A,D
QUESTION NO: 25
Examine the following route-map configuration: route-map test permit 10 match as-path 10 set community no-export additive Which of the statements below is correct?
A. Any route matched by as-path access-list 10 will not be advertised to eBGP peers.
B. Any route matched by as-path access-list 10 will have its BGP community attribute stripped off when the route is propagated to eBGP peers.
C. Any route matched by as-path access-list 10 will have its BGP community overwritten with the no-export community.
D. Any route matched by as-path access-list 10 will have its BGP community attribute stripped off.
Answer: A