5.3. Run Basic Diagnostic Commands and Interpret the Results. 100-150 Practice Questions (Page 7)

Questions 31–35

1. 31foundation · easy

   How does traceroute identify each hop along the path to a destination?

   • ABy using SNMP to query network devices
   • BBy sending packets with increasing TTL values
   • CBy sending ARP requests to each router
   • DBy querying the routing table of each router
   Reveal Solution Discussion Select an answer first
2. 32application · medium

   A user reports that they cannot reach a web server at 10.20.30.40 from their Windows workstation. You run `ping 10.20.30.40` and get four replies with round-trip times of 1 ms. However, when you open a browser to http://10.20.30.40, the page times out. Which diagnostic step should you take next?

   • ARun `nslookup 10.20.30.40` to verify that the IP address resolves to the correct hostname.
   • BRun `telnet 10.20.30.40 80` or `Test-NetConnection 10.20.30.40 -Port 80` to test TCP port 80 connectivity.
   • CRun `ipconfig /flushdns` to clear the local DNS cache and retry the browser.
   • DRun `tracert 10.20.30.40` to see if a firewall is dropping packets at an intermediate hop.
   Reveal Solution Discussion Select an answer first
4. 33foundation · easy

   In traceroute output, some hops show asterisks (* * *) but the trace still completes to the destination. What is the most likely explanation?

   • AThe TTL values are too low
   • BThose routers are configured to not respond to traceroute probes
   • CThe destination is blocking ICMP
   • DThe routers at those hops are down
   Reveal Solution Discussion Select an answer first
5. 34application · medium

   A Windows user has an IP address of 192.168.1.100 with a subnet mask of 255.255.255.0 and a default gateway of 192.168.1.1. The user can ping the gateway but cannot ping a server at 192.168.2.10. What is the most likely cause?

   • AThe server at 192.168.2.10 is on a different subnet, and routing between subnets is not working.
   • BThe user's subnet mask is incorrect, so the server is considered on a different network.
   • CThe user's DNS settings are incorrect.
   • DThe default gateway is not configured correctly.
   Reveal Solution Discussion Select an answer first
6. 35application · medium

   A user reports that accessing a remote server is very slow. You run `tracert` from Windows and see that the first three hops have low latency, but hop 4 shows 300 ms and all subsequent hops show similar high latency. What does this indicate?

   • AThe local router is misconfigured, causing all traffic to be slow.
   • BThe remote server is overloaded and responding slowly.
   • CThere is a network bottleneck or congested link at or after hop 4.
   • DThe firewall at hop 4 is blocking ICMP, causing the high latency.
   Reveal Solution Discussion Select an answer first