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Which ports and protocols are MOST likely to be open on…

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? (Choose FOUR).

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A.
21

B.
22

C.
23

D.
69

E.
3389

F.
SSH

G.
Terminal services

H.
Rlogin

I.
Rsync

J.
Telnet

Explanation:
The question states that Jane was able to establish a connection to an internal router. Typical ports and
protocols used to connect to a router include the following:
B, F: Port 22 which is used by SSH (Secure Shell).
C, J: Port 23 which is used by Telnet.
SSH and Telnet both provide command line interfaces for administering network devices such as routers and
switches.

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