Type, Length, and Values JN0-352 Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   A network engineer is designing a custom IS-IS extension and needs to include a new TLV in the LSP. The TLV will carry a variable-length list of IPv6 prefixes. What is the primary advantage of using the TLV format for this extension?

   • AIt enables the router to parse the TLV without knowing its exact length in advance.
   • BIt ensures the TLV is backward compatible with older routers.
   • CIt allows the TLV to be easily compressed to reduce bandwidth usage.
   • DIt guarantees that the TLV will be processed by all routers in the network.
   Reveal Solution Discussion Select an answer first
2. 7foundation · easy

   What is the purpose of the IS Neighbors TLV (type 2) in IS-IS?

   • ATo specify the authentication information for the PDU
   • BTo advertise the IP addresses of interfaces on a router
   • CTo list the neighboring IS-IS routers that are adjacent
   • DTo indicate the supported network layer protocols
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4. 8expert · easy

   A network engineer is analyzing an IS-IS LSP and sees TLV 135 (Extended IP Reachability) with a prefix of 192.168.10.0/24 and a metric of 50. What does this TLV indicate in the context of the LSP?

   • AThe router has a directly connected network 192.168.10.0/24 with a cost of 50.
   • BThe router is indicating that the prefix is unreachable and the metric is for troubleshooting.
   • CThe router is advertising a default route with a metric of 50.
   • DThe router is advertising a route to a neighbor IS with a cost of 50.
   Reveal Solution Discussion Select an answer first
5. 9application · medium

   While analyzing an IS-IS packet capture, you notice a TLV with Type=1, Length=7, and a value that appears to be 7 bytes of data. The next byte in the packet is 0x83. How does the receiving router know that the next TLV starts at the byte following the 7-byte value?

   • AThe router uses the PDU's overall length field to calculate where the last TLV ends and works backward.
   • BThe router uses the Type field to look up the expected length of the TLV in a static table.
   • CThe router identifies the end of the TLV by searching for the next Type field value that is a known TLV type.
   • DThe router reads the Length field (7) and advances exactly that many bytes past the end of the Length field to find the next TLV.
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   In IS-IS, what does the length field in a TLV indicate?

   • AThe size of the value field in bytes
   • BThe remaining length of the PDU after the TLV
   • CThe total number of TLVs in the PDU
   • DThe type of the TLV
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