Practice 20 Networking Concepts multiple-choice questions designed for CDAC CCAT exam preparation. Click "Show Answer" to reveal the correct option with detailed explanation.
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Correct Answer: C — 7
OSI has 7 layers: Physical, Data Link, Network, Transport, Session, Presentation, Application.
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Correct Answer: B — Network
Network Layer (Layer 3) handles routing and logical addressing.
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Correct Answer: B — Connection-oriented
TCP is connection-oriented and provides reliable data transfer.
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Correct Answer: B — Connectionless
UDP is connectionless, faster but unreliable.
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Correct Answer: B — Network
IP addresses are Network Layer (Layer 3) addresses.
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Correct Answer: B — Data Link
MAC addresses are Data Link Layer (Layer 2) addresses.
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Correct Answer: B — TCP
HTTP uses TCP for reliable web page transfer.
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Correct Answer: C — 53
DNS uses port 53 for domain name resolution.
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Correct Answer: B — Identify network and host portion
Subnet mask separates network and host parts of IP address.
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Correct Answer: A — IP to MAC
ARP (Address Resolution Protocol) converts IP address to MAC address.
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Correct Answer: B — Transport
Transport layer provides end-to-end reliable data delivery between hosts.
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Correct Answer: B — Error reporting and diagnostics
ICMP (Internet Control Message Protocol) is used for error reporting and ping.
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Correct Answer: B — Router connecting to other networks
Default gateway is the router that forwards packets to other networks.
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Correct Answer: A — Network Address Translation
NAT translates private IP addresses to public IP addresses and vice versa.
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Correct Answer: B — Automatic IP address assignment
DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses.
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Correct Answer: C — 128
IPv6 addresses are 128 bits long, compared to 32 bits for IPv4.
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Correct Answer: B — SYN, SYN-ACK, ACK
TCP connection uses SYN, SYN-ACK, ACK for three-way handshake.
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Correct Answer: C — HTTPS
HTTPS uses port 443 for secure web communication.
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Correct Answer: B — 127.0.0.1
127.0.0.1 is the loopback address used to test network on local machine.
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Correct Answer: A — 0.0.0.0 to 127.255.255.255
Class A addresses range from 0.0.0.0 to 127.255.255.255 (first octet 0-127).