Click the exhibit button.
The OSPF adjacency between routers R3 and R1 is down. What is the problem?
Question 6 of 48
Correct Answer: B
Router R3 is shown to have 'authentication-type password' and 'authentication-key', which implies it is using simple password authentication. However, on router R1, 'authentication-type password' is configured with 'message-digest-key', which is typically used for MD5 authentication. Since this mismatch in authentication key type between password and message-digest-key is likely causing the OSPF adjacency to fail, the correct answer is that Router R3 has the incorrect authentication key type.
Question 7 of 48
In which of the following types of areas does an OSPF router not set the E bit in its Type 1 LSA?
Correct Answer: B
In OSPF (Open Shortest Path First) routing, a stub area is a type of area that does not receive external routes. This means advertisements of external routes are not permitted, and thus the E bit in its Type 1 LSA (Link-State Advertisement) is not set. In contrast, normal and backbone areas do allow external routes, and therefore, the E bit would be set in those areas. A not-so-stubby area (NSSA) can have external routes but only those that are redistributed by an NSSA ASBR. Hence, the correct option is the stub area.
Question 8 of 48
Click the exhibit button.
What is the state of adjacency?
Correct Answer: B
The state of the adjacency is indicated by the 'State' field in the right-hand exhibit, which is displayed as 'Up'. Therefore, the correct answer is 'Up'.
Question 9 of 48
Click the exhibit button.
Given the diagram below, what path will traffic follow from router R6 to router R3, and from router R3 to router R6, if IS-IS is the routing protocol? The numbers beside the links are the metrics for that link.
Correct Answer: A
In IS-IS routing protocol, routers use metrics to determine the best path to reach the destination. For traffic from R6 to R3, the route R6-R5-R2-R3 is chosen because the total metric cost is 10 (R6-R5) + 10 (R5-R2) + 15 (R2-R3) = 35. For traffic from R3 to R6, the route R3-R2-R5-R6 is also chosen as R3 will use the same route in reverse to reach R6 due to the symmetrical nature of metric-based path selection, making the total metric cost 15 (R3-R2) + 10 (R2-R5) + 10 (R5-R6) = 35. Both directions follow the same path because they have the same cumulative metric cost.
Question 10 of 48
In IS-IS, which of the following statements regarding an L1/L2 router is false?
Correct Answer: C
An L1/L2 router does not advertise its L2 routes to its L1 neighbors by default. While there are mechanisms such as route leaking that can allow this behavior, it is not the default behavior of an L1/L2 router. L1 routers primarily communicate within their own area and generally do not receive L2 routes unless explicitly configured to do so.