System Administrator 2026 — Test 49

Correct Answer: B. B. VLAN circumvention
Explanation: VLAN Circumvention is data-link layer vulnerability where stations are forced to make direct communication with another station by evading logical controls implemented using subnets and firewalls.

Correct Answer: A. A. Switches
Explanation: Switches may be forced for flooding traffic to all VLAN ports allowing interception of data through any device that are connected to a VLAN. It is a vulnerability of data link layer.

Correct Answer: D. D. Weak or non-existent authentication
Explanation: Weak or non-existent authentication is a vulnerability of the session layer. Route spoofing, identity & resource ID vulnerability & IP Address Spoofing are examples of network layer vulnerability.

Correct Answer: D. D. Keystroke & other input logging
Explanation: Keystroke & other input logging is an example of physical layer vulnerability. Other such physical layer vulnerabilities are unauthorized network access, damage or destruction of data & hardware and keystroke & Other Input Logging.

Correct Answer: B. B. VLAN circumvention
Explanation: VLAN circumvention is an example of data-link layer vulnerability. MAC Address Spoofing, as well as switches, may be forced for flooding traffic to all VLAN ports are some other examples of data-link layer vulnerability.

Correct Answer: C. C. Route spoofing
Explanation: Route spoofing is an example of network layer vulnerability. Other examples of network layer vulnerabilities are IP Address Spoofing and Identity & Resource ID Vulnerability.

Correct Answer: A. A. Uniform resource identifier
Explanation: The Uniform Resource Identifier is a name and locator for the resource to be located by the HTTP. The URLs and URNs are derived through the identifier.

Correct Answer: A. A. Multiple HTTP requests are sent on a single TCP connection without waiting for the corresponding responses
Explanation: HTTP pipelining helps the client make multiple requests without having to waiting for each response, thus saving a lot of time and bandwidth for the client.

Correct Answer: B. B. 21
Explanation: Port 20 is used for FTP data. Port 22 is used for SSH remote login. Port 23 is used for TELNET.

Correct Answer: A. A. Transmission control protocol
Explanation: The clients use the Transmission Control Protocol for FTP as it’s more reliable than UDP, DCCP, and SCTP, and reliability of file transfer is required to be as high as possible for FTP.