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1.  
Consider the following statements about network topologies:
I. In a bus topology a fault in the backbone cable stops the whole network.
II. A star topology with n nodes needs n(n − 1)/2 cables.
III. A full mesh gives the highest reliability because there are many paths between nodes.
Which of the statements given above is/are correct?

Correct Answer: C [Only I and III]

Explanation:

I true; II false – star needs n cables (mesh needs n(n − 1)/2); III true.

2.  
Consider the following statements:
I. The World Wide Web was created before the Internet.
II. A search engine is a kind of web browser.
III. Cookies are small text files that a website stores in the user's browser.
Which of the statements given above is/are correct?

Correct Answer: B [Only III]

Explanation:

I false – ARPANET/Internet came first; II false – a search engine is a website; III true.

3.  
Match the protocol with its port:
List I: (a) SSH; (b) SMTP; (c) DNS; (d) POP3
List II: (1) 110; (2) 22; (3) 53; (4) 25

Correct Answer: B [a-2, b-4, c-3, d-1]

Explanation:

SSH 22; SMTP 25; DNS 53; POP3 110.

4.  
Match the OSI layer with its data unit:
List I: (a) Physical; (b) Data link; (c) Network; (d) Transport
List II: (1) packet; (2) frame; (3) bit; (4) segment

Correct Answer: E [a-3, b-2, c-1, d-4]

Explanation:

Bits – Frames – Packets – Segments, layers 1 to 4.

5.  
Which TCP/IP layer corresponds to the Session, Presentation and Application layers of the OSI model together?

Correct Answer: E [Application]

Explanation:

TCP/IP Application = OSI layers 5, 6 and 7.

6.  
A device has IP address 10.20.30.77/27. What is the address of its network?

Correct Answer: D [10.20.30.64]

Explanation:

/27 → mask 255.255.255.224; 77 AND 224 = 64 (77 = 01001101).

7.  
In the same network (10.20.30.77/27), what is the broadcast address?

Correct Answer: C [10.20.30.95]

Explanation:

Network 10.20.30.64 + 32 addresses − 1 → .95 (all host bits 1).

8.  
Consider the following statements about IPv4 classes:
I. 126.1.1.1 is a class A address.
II. 224.1.1.1 is a class C address.
III. 128.1.1.1 is a class B address.
Which of the statements given above is/are correct?

Correct Answer: D [Only I and III]

Explanation:

126 → A (1–126); 224 → D (multicast), not C; 128 → B (128–191).

9.  
A switch has 24 ports. One port links it to the router. How many computers can be connected to it directly in a star?

Correct Answer: B [23]

Explanation:

24 − 1 port used for the uplink = 23.

10.  
Two offices of 5 and 6 computers are each wired as a full mesh, and one extra cable joins the two meshes. How many cables are used in all?

Correct Answer: A [26]

Explanation:

10 + 15 + 1 = 26. (A single 11-node mesh would need 55.)

11.  
Ravi reads his mail on his phone and laptop and wants both to show the same folders and read/unread status. His mail client should use:

Correct Answer: C [IMAP]

Explanation:

IMAP synchronises the mailbox on the server across devices.

12.  
Which protocol finds the MAC address of a device whose IP address is known?

Correct Answer: E [ARP]

Explanation:

ARP: IP → MAC. DNS: name → IP.

13.  
In the URL http://bank.example.org/branch/list.php?city=salem, the part city=salem is the:

Correct Answer: B [query string]

Explanation:

After ? comes the query string; /branch/list.php is the path.

14.  
When no port is written in a URL that begins with http://, the browser connects to port:

Correct Answer: D [80]

Explanation:

Default HTTP port 80 (HTTPS 443).

15.  
Consider the following statements:
I. A router joins different networks and chooses the path for packets using IP addresses.
II. A repeater filters frames using MAC addresses.
III. A gateway can join networks that use different protocols by translating between them.
Which of the statements given above is/are correct?

Correct Answer: C [Only I and III]

Explanation:

I true; II false – a repeater only regenerates signals (layer 1), a bridge/switch filters by MAC; III true.

16.  
The IPv6 address 2001:0db8:0000:0000:0abc:0000:0000:0001 is correctly shortened as:

Correct Answer: A [2001:db8::abc:0:0:1]

Explanation:

Drop leading zeros; '::' may replace only ONE run of zero groups.

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