ITS153L Final Exam questions and correct answers.pdf

ITS153L Final Exam | 50 Questions and Correct
Answers | 2026/27 Updated | 100% Correct -
Mapúa Institute of Technology.

ITS153L Final Exam | 50 Questions and Correct Answers | 2026/27 Updated |
100% Correct - Mapúa Institute of Technology


SECTION 1: Networking Fundamentals


1. Which layer of the OSI model is responsible for logical addressing and
routing?
A) Physical Layer
B) Data Link Layer
C) Network Layer
D) Transport Layer
Correct Answer: C
Explanation: The Network Layer (Layer 3) is responsible for logical addressing (IP
addresses) and routing packets between different networks. The Physical Layer
handles raw bit transmission, the Data Link Layer handles MAC addressing and
framing, and the Transport Layer handles end-to-end communication and
reliability.


2. A network administrator is studying the rotation of the subnet mask to
determine the number of available hosts. If the subnet mask is 255.255.255.192,
how many usable hosts are available per subnet?

,A) 30
B) 62
C) 126
D) 254
Correct Answer: B
Explanation: The rotation of the subnet mask 255.255.255.192 corresponds to a
/26 CIDR notation. The last octet is 192, which in binary is 11000000. This leaves 6
bits for host addresses (2⁶ = 64 total addresses). Subtracting 2 for the network and
broadcast addresses gives 62 usable hosts.


3. Which of the following is a private IP address range defined by RFC 1918?
A) 8.8.8.0 - 8.8.8.255
B) 172.16.0.0 - 172.31.255.255
C) 192.169.0.0 - 192.169.255.255
D) 224.0.0.0 - 224.0.0.255
Correct Answer: B
Explanation: The private IP address ranges defined by RFC 1918 are:
• 10.0.0.0 - 10.255.255.255 (Class A)
• 172.16.0.0 - 172.31.255.255 (Class B)
• 192.168.0.0 - 192.168.255.255 (Class C)
Option A is a public DNS server, Option C is not a private range, and Option
D is a multicast range.


4. A student is studying the rotation of the TCP three-way handshake. What is
the correct sequence of messages exchanged?
A) SYN, ACK, SYN-ACK
B) SYN, SYN-ACK, ACK

, C) ACK, SYN, SYN-ACK
D) SYN-ACK, SYN, ACK
Correct Answer: B
Explanation: The rotation of the TCP three-way handshake follows this sequence:
1. Client sends SYN (synchronize) to server.
2. Server responds with SYN-ACK (synchronize-acknowledge).
3. Client sends ACK (acknowledge) to complete the connection.
This establishes a reliable connection between the two endpoints.


5. Which protocol is used for secure remote access to a network device?
A) Telnet
B) SSH
C) FTP
D) HTTP
Correct Answer: B
Explanation: SSH (Secure Shell) is used for secure remote access to network
devices. It encrypts all communication, including passwords and commands.
Telnet is unsecured, FTP is for file transfer, and HTTP is for web browsing.


6. A network technician is studying the rotation of the ARP cache to resolve IP
addresses to MAC addresses. What is the primary function of ARP?
A) To resolve domain names to IP addresses
B) To resolve IP addresses to MAC addresses
C) To resolve MAC addresses to IP addresses
D) To resolve port numbers to services
Correct Answer: B
Explanation: The rotation of the ARP cache refers to the Address Resolution
Protocol (ARP), which resolves IP addresses to MAC addresses on a local network.