Comprehensive and Detailed In-Depth Explanation:
1. Understanding the Network Setup
* PE1 (Provider Edge 1) is the gateway for network 192.168.1.1/24.
* PE2 (Provider Edge 2) is the gateway for network 192.168.2.1/24.
* A cloud-based backbone connects PE1 and PE2.
* To verify end-to-end communication, engineers need to check reachability between PE1 and PE2.
2. Evaluating Each Answer Option
* Option A: "Configuring NQA on PE1 and PE2, with the destination address being the IP address of each other."
* # Correct.
* NQA (Network Quality Analysis) is a network testing tool that allows connectivity testing between two devices.
* Configuring NQA between PE1 and PE2 will verify end-to-end reachability.
* Option B: "On PE1 and PE2, checking whether the ARP table contains the ARP entry of the peer network segment."
* # Incorrect.
* ARP (Address Resolution Protocol) is only used for resolving MAC addresses within the same broadcast domain.
* Since PE1 and PE2 are in different network segments (separated by a routed network), they will not have ARP entries for each other.
* Instead, routing entries should be checked, not ARP.
* Option C: "On PE1, using 192.168.1.1 as the source address to ping 192.168.2.1."
* # Correct.
* A simple ping test using the source address of PE1 (192.168.1.1) to reach PE2 (192.168.2.1) will verify whether routing between the two locations is functional.
* Option D: "On PE1 and PE2, checking whether there are routes to each other's network segment in the routing tables."
* # Correct.
* If routing is not configured correctly, PE1 and PE2 will not know how to reach each other.
* Checking the routing table ensures that both PEs have the correct next-hop information.
Final Answer:
# A, C, and D are correct.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* Using NQA for Network Connectivity Testing
* Verifying Routing Table Entries for Inter-Network Communication
* Understanding ARP and Its Limitations in Routed Networks