Which two statements about eBGP neighbor relationships are true? (Choose two.)
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A. B. C. D. E.AB
The correct answers are A and B.
A. The two devices must reside in different autonomous systems: External Border Gateway Protocol (eBGP) is used to establish neighbor relationships between routers in different Autonomous Systems (AS). This is because eBGP is designed to exchange routing information between different administrative domains or ASes. If two routers reside in the same AS, they would use Internal BGP (iBGP) instead.
B. Neighbors must be specifically declared in the configuration of each device: Before eBGP neighbors can exchange routing information, they must be explicitly configured on each device. This is usually done by specifying the IP address of the remote neighbor and other parameters such as the autonomous system number and the authentication key (if used).
C. They can be created dynamically after the network statement is configured: This statement is incorrect. eBGP neighbors cannot be created dynamically after the network statement is configured. The network statement is used to identify the networks that will be advertised to eBGP neighbors, not to create neighbor relationships.
D. The two devices must reside in the same autonomous system: This statement is incorrect. As mentioned earlier, eBGP is used to establish neighbor relationships between routers in different autonomous systems.
E. The two devices must have matching timer settings: This statement is also incorrect. While it is recommended to have matching timer settings for eBGP neighbors, it is not a requirement for the establishment of a neighbor relationship. The timers are used to control the frequency and duration of the keepalive messages sent between neighbors to ensure that the connection is still active. If the timers are not configured to match, the neighbors can still establish a relationship but may experience suboptimal routing performance.