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).

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.