M3Q16: Core Protocols

Question 1

The following protocols allow for command line access to network devices.

(choose all that apply)

A. ICMP
B. SSH
C. RDP
D. Telnet

Answer 1

B. (SSH), D. (Telnet)

Explanation: SSH (Secure Shell) and Telnet are both protocols for remote access to the command line interface of network devices. SSH uses encryption while Telnet does not; all Telnet traffic is completely clear text. SSH or Telnet could be used to access a remote router, firewall, or switch to make configuration changes from a remote location.

Question 2

Telnet should be used instead of SSH for security purposes.

A. True
B. False

Answer 2

B. False

Explanation: Using Telnet is a security concern for companies because all communications over Telnet are in clear text, even usernames and passwords. SSH should be used instead in order to increase security with remote access to network devices.

Question 3

Which of the following TCP ports are used by SSH. (choose all that apply)

A. 20
B. 21
C. 22
D. 23

Answer 3

C. 22

Explanation: SSH (Secure Shell) uses TCP port 22

Question 4

Which of the following TCP ports are used by Telnet.

(choose all that apply)

A. 20
B. 21
C. 22
D. 23

Answer 4

D. 23

Explanation: Telnet uses TCP port 23.

Question 5

______________ is the protocol responsible for ping and traceroute.

A. ICMP
B. RDP
C. TFTP
D. Ping

Answer 5

A. ICMP

Explanation: ICMP (Internet Control Message Protocol) is used by applications such as Ping and Traceroute to produce IP based reachability outputs. With the Ping application in particular the ICMP Echo and ICMP Echo reply are used to check IP reachability status of a network node.

Question 6

Which of the following TCP ports are used by FTP.

(choose all that apply)

A. 20
B. 21
C. 22
D. 23

Answer 6

A. (20), B. (21)

Explanation: FTP (File Transfer Protocol) uses TCP port 20 (FTP data transfer) & 21 (FTP control). Port 21 use used to manage the FTP sessions and port 20 is the port which the data actually transfers over during the file transfer.

Question 7

Trivial File Transfer Protocol (TFTP) uses UDP port 69 and is considered to be connectionoriented.

A. True
B. False

Answer 7

B. False

Explanation: TFTP (Trivial File Transfer Protocol) does use UDP port 69, but because it uses UDP is considered to be connection-less. FTP on the other hand uses TCP and is connection-oriented.