During a penetration test from the Internet, Jane, the system administrator, was able to establish a connection to an internal router, but not successfully log in to it. Which ports and protocols…

The correct answer is B. 22 C. 23 F. SSH J. Telnet. Jane established a connection to the router but could not log in, meaning the remote management ports are open and accepting connections. Routers and switches are typically managed via SSH (port 22) and Telnet (port 23). Choices B (port 22) and F (SSH) both refer to the same…

Threats, vulnerabilities, and mitigations

Question

During a penetration test from the Internet, Jane, the system administrator, was able to establish a connection to an internal router, but not successfully log in to it. Which ports and protocols are MOST likely to be open on the firewall? (Select FOUR).

Options

A21
B22
C23
D69
E3389
FSSH
GTerminal services
HRlogin
IRsync
JTelnet

How the community answered

(47 responses)

B
70% (33)
D
2% (1)
E
15% (7)
G
9% (4)
H
4% (2)

Explanation

Jane established a connection to the router but could not log in, meaning the remote management ports are open and accepting connections. Routers and switches are typically managed via SSH (port 22) and Telnet (port 23). Choices B (port 22) and F (SSH) both refer to the same protocol, as do C (port 23) and J (Telnet) - so selecting all four is consistent with two open services. Port 21 (FTP), port 69 (TFTP), port 3389 (RDP/Terminal Services), Rlogin, and Rsync are not standard router CLI management protocols and are therefore not the most likely open ports in this scenario.

Topics

#firewall ports#penetration testing#network protocols#remote access

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