Examkin

Question

Difficulty: MediumUtilizing Command-Line Network Troubleshooting Utilities

A network administrator is investigating an issue where a client workstation (10.20.40.1510.20.40.15) fails to connect to an internal web service running on port 80808080 at 10.20.40.25010.20.40.250. The administrator executes two command-line diagnostic utilities from the workstation, producing the following terminal outputs:

Command 1: `ping 10.20.40.250`

Pinging 10.20.40.250 with 32 bytes of data:
Reply from 10.20.40.250: bytes=32 time=2ms TTL=64
Reply from 10.20.40.250: bytes=32 time=1ms TTL=64

Command 2: `tracert -d 10.20.40.250`

Tracing route to 10.20.40.250 over a maximum of 30 hops
1 <1 ms <1 ms <1 ms 10.20.40.250
Trace complete.

Based on these diagnostic results, which TWO of the following conclusions are valid? (Select TWO.)

  1. The destination host resides on the same local network segment as the client workstation.Answer
  2. Basic Layer 3 IP reachability to the destination host is confirmed via ICMP.Answer
  3. C
    The -d switch was applied in the tracert command to force DNS name resolution on all network hop IP addresses.
  4. D
    The successful ICMP responses confirm that the target web application service on TCP port 8080 is active and accepting connections.

Answer

The destination host resides on the same local network segment as the client workstation, and basic Layer 3 IP reachability to the destination host is confirmed via ICMP.
A single hop in the traceroute output confirms that the client workstation and target server share the same local network segment without crossing a router. Furthermore, receiving ICMP echo replies from ping validates basic Layer 3 IP reachability.

Step-by-Step Solution

1
Analyze the ping command output.
Received successful ICMP Echo replies from 10.20.40.250 with low round-trip times.
Confirms operational Layer 3 IP reachability between the client and server.
2
Analyze the tracert -d command output.
The target IP address is reached in a single hop.
Indicates no intermediate routers were traversed, proving both hosts reside on the same broadcast domain and IP subnet.
3
Evaluate the limitation of ping regarding TCP port testing.
Recognize that ICMP reachability does not guarantee that TCP port 8080 is open or listening.
ICMP functions at the Network layer (Layer 3), whereas TCP port 8080 operates at the Transport layer (Layer 4).

Key Concept

Utilizing Command-Line Network Troubleshooting Utilities
Rate this question

Topics

Utilizing Command-Line Network Troubleshooting Utilities

More questions from this topic