Foundations of Network Communication GISF Practice Questions (Page 7)

Questions 31–35

1. 31expert · hard

   A network administrator is troubleshooting intermittent connectivity. A host at 192.168.1.10 cannot reach a host at 192.168.1.20, but other hosts can reach both. The ARP cache on the source host shows an incomplete entry for 192.168.1.20. What is the most likely cause?

   • AThe source host's IP address is a duplicate on the network.
   • BThe destination host has a different subnet mask.
   • CThe destination host is not responding to ARP requests.
   • DThe source host has the wrong default gateway configured.
   Reveal Solution Discussion Select an answer first
2. 32foundation · easy

   What is a socket in network communication?

   • AThe combination of an IP address and a port number
   • BA reserved range of port numbers for system services
   • CThe physical connector on a network interface card
   • DA software application that manages network connections
   Reveal Solution Discussion Select an answer first
4. 33expert · hard

   A company's website, www.example.com, is hosted on a server with IP 203.0.113.10. Users report that they can access the site by IP but not by name. The DNS administrator checks the authoritative server and finds the A record is correct. Which additional check is most likely to reveal the issue?

   • ACheck the server's ARP cache
   • BCheck the web server's TLS certificate
   • CVerify that the domain's NS records at the TLD point to the correct authoritative servers
   • DVerify that the server's firewall allows inbound TCP port 80
   Reveal Solution Discussion Select an answer first
5. 34expert · hard

   A company's website www.example.com is hosted on a server with IP 203.0.113.10. Users report intermittent failures when accessing the site. The DNS administrator checks the authoritative name server and finds an A record for www.example.com pointing to 203.0.113.10. What is the most likely cause of the intermittent failures?

   • AThe users are using the wrong DNS server.
   • BThe web server is down.
   • CA misconfigured DNS cache on the users' local resolver returning an old or incorrect IP address.
   • DThe domain registrar has expired the domain.
   Reveal Solution Discussion Select an answer first
6. 35application · medium

   A server hosts both a web server on port 443 and an SSH server on port 22. A client connects to the web server. Which combination uniquely identifies the client-side socket for this connection?

   • AServer MAC address and server port 22
   • BClient MAC address and client IP address
   • CClient IP address and client ephemeral port
   • DServer IP address and server port 443
   Reveal Solution Discussion Select an answer first