Explain Application Client-Server Communication F5CAB5 Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A client is trying to download a file from an FTP server. The client connects to the FTP server on port 21 and authenticates successfully. However, when the client tries to list files or download a file, the connection times out. The BIG-IP is load balancing the FTP traffic. What is the most likely cause?

   • AThe FTP data connection is not being handled correctly by the BIG-IP.
   • BThe client's firewall is blocking port 21.
   • CThe FTP server is not listening on port 21.
   • DThe client is using passive mode, which the server does not support.
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2. 12application · medium

   A client is trying to access a website hosted on a server with IP address 203.0.113.5. The client's DNS resolver returns the correct IP address. However, the client cannot connect to the server. The administrator checks the BIG-IP and sees that the virtual server is listening on 203.0.113.5:80. What is the most likely cause of the connection failure?

   • AThe DNS resolution is correct, but the client's network is blocking outbound traffic to port 80.
   • BThe server is not listening on port 80, so the connection is refused.
   • CThe client's DNS resolver is returning a different IP address than the server's.
   • DThe client is using HTTPS instead of HTTP, so the request goes to port 443, which is not configured.
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4. 13foundation · easy

   Which HTTP method is used to submit data to a server, typically causing a change in server state?

   • AOPTIONS
   • BGET
   • CPOST
   • DHEAD
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5. 14foundation · easy

   What is the primary purpose of HTTPS compared to HTTP?

   • AHTTPS allows the server to authenticate the client.
   • BHTTPS encrypts the data exchanged between client and server.
   • CHTTPS compresses data to reduce bandwidth usage.
   • DHTTPS uses a different port (443) to improve performance.
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6. 15expert · hard

   A client is trying to access a website that is hosted on a BIG-IP virtual server. The client's DNS resolver returns a CNAME record that points to another domain. The client then resolves the new domain to an IP address. However, the client receives a certificate error. What is the most likely cause?

   • AThe DNS CNAME record is causing the client to connect to the wrong IP address.
   • BThe certificate on the server does not match the domain name the client used in the URL.
   • CThe client is using HTTP instead of HTTPS, so the certificate is not validated.
   • DThe BIG-IP is not configured with a client-side SSL profile, so the handshake fails.
   Reveal Solution Discussion Select an answer first