BSCS : Network Fundamentals 3 — Questions and Answers
Question 1: A network uses the address 192.168.10.0/24. How many usable host addresses are available?
- 254 (Correct answer)
- 256
- 255
- 253
Correct answer: 254
A /24 network has 256 total addresses; subtracting the network address and broadcast address leaves 254 usable host addresses.
Question 2: Which topology connects every node directly to every other node, providing the highest redundancy?
- Star
- Bus
- Ring
- Full-mesh (Correct answer)
Correct answer: Full-mesh
A full-mesh topology creates a direct link between every pair of nodes, maximizing fault tolerance at the cost of many links.
Question 3: What is the well-known port number for HTTPS?
- 80
- 21
- 443 (Correct answer)
- 8080
Correct answer: 443
HTTPS (HTTP over TLS/SSL) uses port 443 by default to secure web communication.
Question 4: Which IPv6 address type is equivalent to the IPv4 loopback address 127.0.0.1?
- ::1 (Correct answer)
- fe80::1
- ff02::1
- 2001:db8::1
Correct answer: ::1
The IPv6 loopback address is ::1, which represents a single interface used for testing the local stack, equivalent to 127.0.0.1 in IPv4.
Question 5: Which protocol resolves a MAC address to an IP address (the reverse of ARP)?
- RARP (Correct answer)
- ICMP
- NAT
- DHCP
Correct answer: RARP
RARP (Reverse ARP) allows a device that knows its MAC address to discover its IP address, though it has largely been replaced by DHCP.
Question 6: In the context of Ethernet, what is the maximum length of a standard UTP Cat5e cable segment before signal degradation requires a repeater?
- 50 meters
- 100 meters (Correct answer)
- 185 meters
- 500 meters
Correct answer: 100 meters
The IEEE 802.3 standard specifies a maximum segment length of 100 meters for UTP copper Ethernet cabling.
Question 7: What does the Time-to-Live (TTL) field in an IP packet prevent?
- Packet fragmentation
- Routing loops causing packets to circulate indefinitely (Correct answer)
- Duplicate packet delivery
- IP address spoofing
Correct answer: Routing loops causing packets to circulate indefinitely
TTL is decremented by each router; when it reaches zero the packet is discarded, preventing packets from looping forever in misconfigured networks.
BSCS : Network Fundamentals 3
A network uses the address 192.168.10.0/24.
How many usable host addresses are available?