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).
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.
In here we must select four answers:
• Two answers relate to PORTS
• Two answers relate to PROTOCOLS and
• The PORT must match the relevant PROTOCOL
PORTS & PROTOCOLS
So port 22 = SSH
Port 23 = 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: SSH, Telnet
SSH and Telnet both provide command line interfaces for administering network devices such as
routers and switches.
So here are our pairs:
• B & F: Port 22 which is used by SSH (Secure Shell).
• C & J: Port 23 which is used by Telnet.
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