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Juniper MX Series by Harry Reynolds, Douglas Richard Hanks Jr.

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Chapter Review Answers

  1. Answer: C. The last major release of Junos of a given calendar year is known as the Extended End of Life (EEOL) release and is supported for three years.

  2. Answer: D. The data/forwarding plane handles all packet processing such as firewall filters, policers, or counters on the interface xe-0/0/0.0.

  3. Answer: B. The MX960 requires three SCBs for full redundancy. This is known as 2 + 1 SCB redundancy.

  4. Answer: A. The major functional blocks of Trio are Interfaces, Buffering, Dense Queuing, and Lookup.

  5. Answer: C. The MX-3D provides full Layer 2 and limited Layer 3 functionality. There’s a limit of 32,000 prefixes in the route table.

  6. Answer: B. The MPC2 line card has two Trio chipsets. This allows each MIC to have a dedicated Trio chipset.

  7. Answer: C. The Ethernet switch located on the MX SCB is used to create a full mesh between all line cards and routing engines. This network processes updates and exception packets.

  8. Answer: B. The sequence number is used to reassemble out of order packets on the destination PFE.

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