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NEW QUESTION # 158
On a broadcast IS-IS network shown in the following figure, a DIS needs to be elected to create and update pseudonodes. Which of the following routers is elected as the DIS?
Answer: D
Explanation:
Understanding DIS Election in IS-IS:
On an IS-IS broadcast network, a Designated Intermediate System (DIS) is elected to create and update pseudonodes for efficient communication.
The election is based on the following criteria:
DIS Priority: The router with the highest priority is elected as the DIS.
Router ID (tie-breaker): If priorities are equal, the router with the highest Router ID is elected.
Analyzing the DIS Priorities and Router IDs:
R1: Priority = 64, Router ID = 1.1.1.1
R2: Priority = 1, Router ID = 2.2.2.2
R3: Priority = 127, Router ID = 3.3.3.3
R4: Priority = 10, Router ID = 4.4.4.4
Among the routers, R3 has the highest DIS priority (127), making it the DIS.
Correct Option:
Option B (R3): Correct, as R3 has the highest priority.
Option A (R1): Incorrect, as its priority is lower (64).
Option C (R4): Incorrect, as its priority is lower (10).
Option D (R2): Incorrect, as its priority is the lowest (1).
References:
HCIA-Datacom Study Guide, Chapter: IS-IS DIS Election
Huawei IS-IS Configuration and DIS Role Details
NEW QUESTION # 159
BGP is generally applied to complex networks where routes change frequently. Frequent route flapping consumes a large number of bandwidth and CPU resources, and even affects the normal operation of the network. This is an unavoidable problem that cannot be solved in BGP.
Answer: B
Explanation:
BGP Route Flapping and Mitigation
While route flapping is a concern in large-scale networks, BGP employs mechanisms such as Route Dampening to mitigate its impact. Route dampening suppresses frequently flapping routes for a period of time to reduce resource consumption and network instability. Therefore, it is incorrect to state that the issue cannot be resolved in BGP.
NEW QUESTION # 160
As shown in the figure, R1 and R2 form a VRRP backup group 1. By executing the vrrp vrid 1 vitual- ip () command on R1, it can become the IP address owner, making R1 the Master and R2 the Backup.
Answer:
Explanation:
192.168.1.254
NEW QUESTION # 161
The port role that cannot be in the forwarding state in RSTP is? (Multiple choice)
Answer: A,C
NEW QUESTION # 162
Which of the following descriptions about IGMP Proxy are correct? (Multiple choice)
Answer: B,C
NEW QUESTION # 163
......
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