CCIE R&S 400-101 V5.1 Written Exam: Identify, Implement and Troubleshoot IPv4 Addressing and Subnetting

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CCIE R&S 400-101 V5.1 Written Exam: Identify, Implement and Troubleshoot IPv4 Addressing and Subnetting

In this article, I will be discussing Cisco Identify, Implement and Troubleshoot IPv4 Addressing and Subnetting as part of Layer 3 Technologies and Addressing Technologies CCIE Routing and Switching (R&S) V5.1 exam blueprint topics.

Addressing Technologies

  • Identify, Implement and Troubleshoot IPv4 Addressing and Subnetting
    • Address types, VLSM
    • ARP

Let me summarize some of the key takeaways related to Identify, Implement and Troubleshoot IPv4 Addressing and Subnetting as relevant to CCIE Routing and Switching (R&S) V5.1 written exam blueprint topics.

Identify, Implement and Troubleshoot IPv4 Addressing and Subnetting Exam Essentials

  • A router that performs Directed ARP procedures might advertise a foreign next-hop to a host that does not perform Directed ARP
  • A host or router could verify link level connectivity with a next-hop router by sending an ICMP echo to the link level address of the next-hop router (ICMP echo is sent directly to the link level address of the next-hop router).
  • Proxy ARP must be used on the network where IP hosts are not configured with a default gateway or do not have any routing intelligence. It can help route traffic to external network even if the host sending ARP has a different subnet mask configured.
  • When configured with an exit interface on a multipoint broadcast medium such as the ethernet, the neighboring router with access to the addresses within the prefix in the static route, must have proxy ARP enabled.
  • The default ARP table aging time is 4 hours while the CAM holds the entries for only 5 minutes. The switch sends out a frame to all forwarding ports within the respective VLAN when the destination MAC address is aged out from the CAM table. You need a CAM aging timer greater or equal to the ARP timeout in order to prevent recurring unicast flooding.
  • If the router is policy routing packets to the next hop and the next hop is down, the router will try unsuccessfully to use Address Resolution Protocol (ARP) for the next hop (which is down). This behavior will continue indefinitely unless you use “set ip next-hop verify-availability” command.

I sincerely hope that you found this article and video helpful. Please post your questions or suggestions in the comments and tell me how you are preparing for your CCIE Routing and Switching (R&S) V5.1 written and lab exams.

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