Which address class specifies an initial octet value spanning from 128 to 191 under traditional classful IP routing protocols? MCQ with Answer and Explanation

Question

Which address class specifies an initial octet value spanning from 128 to 191 under traditional classful IP routing protocols?

A. Class A

B. Class D

C. Class B

D. Class C

Answer: Option C

Solution (By JKSSB Mock Tests)

Class B IP addresses feature a first octet ranging from 128 to 191, typically mapped to medium-sized corporate networks.

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Which type of network connection allows communication to flow in both directions at the same time (e.g., a standard cellular phone conversation)?

A. Asynchronous

B. Full-Duplex

C. Half-Duplex

D. Simplex

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Correct Answer: Option B

Explanation:
Full-duplex links support simultaneous bidirectional transmission, allowing devices to send and receive data at the same time.

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Question #2

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Which of the following is a port used by DNS?

A. 53

B. 443

C. 80

D. 25

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Correct Answer: Option A

Explanation:
DNS uses port 53 (both TCP and UDP).

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Question #3

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Which networking utility uses ICMP packets to verify if a remote destination host is online and record round-trip latency metrics?

A. IPCONFIG

B. NSLOOKUP

C. TRACERT

D. PING

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Correct Answer: Option D

Explanation:
The ping command uses ICMP Echo Request and Echo Reply packets to test basic network connectivity and measure latency.

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