642-902 Q&A – Implement an eBGP based solution (36-40)

Section 3 – Implement an eBGP based solution, given a network design and a set of requirements

QUESTION NO: 36
For the accompanying router output, which of the following statements describes the state that neighbor 172.16.254.3 is in? Select the best response.
37

A. The router will not accept connections from the peer.
B. The router has sent out an active TCP connection request to the peer.
C. The router is listening on its server port for connection requests from the peer.
D. BGP can exchange routing information in this state.
Answer: C

QUESTION NO: 37
Study the configuration presented in the exhibit carefully. What is the objective of the route map named test?

36
A. marks all prefixes received from the 10.1.1.1 neighbor with a MED of 200
B. marks the 10.0.0.0/8 prefix received from the 10.1.1.1 neighbor with a MED of 200
C. marks the 10.0.0.0/8 prefix advertised to the 10.1.1.1 neighbor with a MED of 200
D. marks all prefixes advertised to the 10.1.1.1 neighbor with a MED of 200
Answer: C
Explanation:
The Multiple-exit-discriminator (MED) attribute is an optional nontransitive attribute, type code 4.
MED informs external neighbors about the preferred path into an AS that has multiple entry points.
A lower MED is preferred over a higher MED.
Unlike Local Preference, the MED attribute is exchanged between autonomous systems, but a MED attribute that comes into an AS does not leave the AS. When an update enters the AS with a certain MED value, that value is used for decision making within the AS. When BGP forwards the routing update to another AS, the MED is reset to zero. This is true unless the outgoing MED is set to a specific value.
Example:

RTB(config)# route-map setmedout permit 10
RTB(config-route-map)# set metric 50
RTB(config)#router bgp 400

QUESTION NO: 38
Refer to the exhibit. On the basis of the information in the exhibit, which two statements are true? (Choose two.) Select 2 response(s).

38
A. The output was generated by entering the show ip bgp command on the ISP router.
B. The output was generated by entering the show ip bgp command on the SanJose1 router.
C. The serial 0/0/1 interface on the ISP router has been configured with the set metric 50 command.
D. The serial 0/0/1 interface on the ISP router has been configured with the set metric 75 command.
E. When traffic is sent from the ISP to autonomous system 64512, the traffic will be forwarded to SanJose1 because of the lower MED value of SanJose1.
F. When traffic is sent from the ISP to autonomous system 64512, the traffic will be forwarded to SanJose2 because of the higher MED value of SanJose2.
Answer: AE
Explanation:
The “show ip route bgp” command will display any BGP-learned routes that make it into the IP routing table, the command “show ip bgp” is required to display the contents of the actual BGP routing table. This output was seen on ISP because the local router ID is 192.168.100.1 (ISP).
Since we know that this output must have been seen by ISP, we know the serial 0/0/1 interface has been configured with a metric of 75, as this is the metric to the peer with IP address 192.168.1.2 (the other side of the serial 0/0/1 interface).

QUESTION NO: 39
Refer to the exhibit. Which two statements are correct? (Choose two.) Select 2 response(s).
39
A. All six routes will be installed in the routing table.
B. Two routes will be installed in the routing table.
C. Four routes will be installed in the routing table.
D. All the routes were redistributed into BGP from an IGP.
E. All the routes were originated by BGP with the network command.
Answer: CD

QUESTION NO: 40
Refer to the exhibit. Router RT-1 chooses one path to network 198.133.219.0/24. Indicate the reason Router RT-1 chooses this “best” path. Select the best response.

40
A. In making its decision about the best path, RT-1 gives precedence to the origin code.
B. In making its decision about the best path, RT-1 gives precedence to the BGP MED values.
C. IP address 128.107.2.2 is lower than 128.107.255.2.
D. In making its decision about the best path, RT-1 prefers the IGP metrics.
E. RT-1 prefers internal BGP routes.
F. IP address 128.107.254.2 is lower than 128.107.255.2.
Answer: A
Explanation:
After BGP receives updates about different destinations from different autonomous systems, it chooses the best path to reach a specific destination.
The following process summarizes how BGP chooses the best route on a Cisco router. Prefer the route with the highest weight. (The weight attribute is proprietary to Cisco and is local to the router only.) If multiple routes have the same weight, prefer the route with the highest local preference value. (The local preference is used within an autonomous system.) If multiple routes have the same local preference, prefer the route that the local router originated. A locally originated route has a next hop of 0.0.0.0 in the BGP table. If none of the routes were locally originated, prefer the route with the shortest autonomous system path. If the autonomous system path length is the same, prefer the lowest origin code (IGP < EGP < incomplete). If all origin codes are the same, prefer the path with the lowest MED. (The MED is exchanged between autonomous systems.) The MED comparison is made only if the neighboring autonomous system is the same for all routes considered, unless the bgp always-compare-med command is enabled If the routes have the same MED, prefer external paths to internal paths. If synchronization is disabled and only internal paths remain, prefer the path through the closest IGP neighbor, which means that the router prefers the shortest internal path within the autonomous system to reach the destination (the shortest path to the BGP next hop). For EBGP paths, select the oldest route to minimize the effect of routes going up and down (flapping). Prefer the route with the lowest neighbor BGP router ID value. If the BGP router IDs are the same, prefer the router with the lowest neighbor IP address.

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