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Free H12-821_V1.0 Exam Braindumps (page: 20)

Page 19 of 56
PDF with 219 Questions

A local router runs IS-IS and its command output is shown in the following figure.
Which of the following statements is true?

  1. The circuit level of S4/0/0 is Level-1.
  2. S4/0/0 supports IPv6.
  3. S4/0/0 sends IIH packets at the interval of 30s.
  4. The cost of S4/0/0 is 20.

Answer(s): D

Explanation:

From the command output, the interface S4/0/0 has its cost value explicitly listed under the Cost section as 20 for Level-1 circuits. This means that all traffic routed through this interface will incur this cost in the IS-IS metric calculation. The other options (such as circuit level and IPv6 support) are either not correct or not supported by the provided output .



Four routers run ISIS and have established adjacencies. The area IDs and router levels are marked in the following figure. If route leaking is configured on R3, which of the following is the cost of the route from R4 to 10.0.2.2/32?

  1. 80
  2. 50
  3. 40
  4. 30

Answer(s): A

Explanation:

In the given topology, the route from R4 to 10.0.2.2/32 traverses R3, which performs route leaking from Level-2 to Level-1. The cost is calculated as follows: R4 to R3 (40) + R3 to R2 (10) + R2 to the destination (30), resulting in a total cost of 80 .



Which of the following is the default interval at which the DIS on a broadcast IS_IS network sends

CSNPs.

  1. 30
  2. 3.3
  3. 10
  4. 40

Answer(s): A

Explanation:

The Designated Intermediate System (DIS) in an IS-IS broadcast network sends Complete Sequence Number PDUs (CSNPs) at a default interval of 30 seconds. This interval ensures periodic synchronization of the Link State Database (LSDB) among IS-IS neighbors .



Refer to the figure. RTA, RTB, RTC, and RTD are in the same AS 200 and establish IBGP peer relationships through direct links. RTB and RTC are Route Reflectors (RRs), while RTA and RTC are RR clients of RTB, and RTB and RTD are RR clients of RTC.

If RTA advertises the route 10.1.1.0/24 to the BGP process, what is the Originator ID of the BGP route received by RTD?

  1. 1.1.1.1
  2. 2.2.2.2
  3. 3.3.3.3
  4. RTD’s Router ID

Answer(s): A

Explanation:

Originator ID is a BGP attribute used in Route Reflector (RR) topologies to prevent routing loops. It stores the Router ID of the original router that first advertised the route.
RTA (Router ID 1.1.1.1) originates the route 10.1.1.0/24 and sends it to RTB (RR).
RTB reflects the route to RTC without modifying the Originator ID.
RTC further reflects the route to RTD, still keeping the Originator ID = 1.1.1.1.
RTD receives the route, and since the Originator ID is never changed by RRs, it remains 1.1.1.1 (RTA’s Router ID).
Thus, RTD receives the BGP route with the Originator ID set to 1.1.1.1.






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