5.3. Run Basic Diagnostic Commands and Interpret the Results. 100-150 Practice Questions (Page 3)

Questions 11–15

1. 11expert · hard

   A network administrator is troubleshooting a server that cannot connect to the internet. The server has a static IP configuration. The administrator runs `ip addr show` and sees: `inet 192.168.1.100/24` on eth0, and `state UP`. They run `ip route show` and see: `default via 192.168.1.1 dev eth0`. The server can ping 192.168.1.1 but cannot ping 8.8.8.8. What is the MOST likely cause?

   • AThe server's network cable is faulty.
   • BThe default gateway is not forwarding traffic to the internet.
   • CThe server's DNS settings are misconfigured.
   • DThe server's subnet mask is incorrect.
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A macOS user cannot connect to the network. You run `ifconfig en0` and see: `en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500` and `inet 192.168.1.50 netmask 0xffffff00 broadcast 192.168.1.255`. What can you conclude?

   • AThe interface is not connected because the netmask is in hexadecimal.
   • BThe interface is up and has a valid IP configuration.
   • CThe interface is down because it has no default gateway listed.
   • DThe interface is using an APIPA address because it starts with 192.168.
   Reveal Solution Discussion Select an answer first
4. 13foundation · easy

   What is the primary function of the nslookup command?

   • ATo display the local IP configuration
   • BTo trace the route to a destination
   • CTo query DNS servers to resolve hostnames to IP addresses
   • DTo test network connectivity by sending ICMP packets
   Reveal Solution Discussion Select an answer first
5. 14foundation · easy

   A traceroute shows that hop 5 has an average response time of 200 ms, while hops 4 and 6 have average times of 20 ms. What does this most likely indicate?

   • AHop 5 is experiencing congestion or has a slow link
   • BHop 5 is the destination
   • CHop 5 is not responding
   • DHop 5 is blocking ICMP traffic
   Reveal Solution Discussion Select an answer first
6. 15expert · hard

   A Linux server has two network interfaces: eth0 with IP 192.168.1.10/24 and eth1 with IP 10.0.0.10/24. The server can ping hosts on the 192.168.1.0/24 network but cannot ping hosts on the 10.0.0.0/24 network. You run `ip addr show` and see both interfaces are UP. What is the most likely cause?

   • AThe eth1 interface is not configured with a subnet mask.
   • BThe eth1 interface has no default gateway configured.
   • CThe firewall on the server is blocking ICMP on eth1.
   • DThe server's routing table does not have a route to the 10.0.0.0/24 network, or the route is incorrect.
   Reveal Solution Discussion Select an answer first