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1.  
A network that covers one bank branch building is a:

Correct Answer: B [LAN]

Explanation:

A building or campus network is a Local Area Network.

2.  
Which device sends every incoming message to all its ports?

Correct Answer: A [Hub]

Explanation:

A hub broadcasts; a switch picks the port by MAC address.

3.  
Which protocol is used to send e-mail from a client to a mail server?

Correct Answer: D [SMTP]

Explanation:

SMTP sends; POP3 and IMAP are used to receive.

4.  
How many bits are there in an IPv4 address?

Correct Answer: C [32]

Explanation:

IPv4 = 32 bits (four octets).

5.  
The default port number of HTTP is:

Correct Answer: D [80]

Explanation:

HTTP 80; HTTPS 443; FTP 21; SMTP 25.

6.  
In which topology is every node connected to a central device?

Correct Answer: A [Star]

Explanation:

Star = every node to a central hub/switch.

7.  
Which device converts digital signals into analog signals and back?

Correct Answer: B [Modem]

Explanation:

MOdulator–DEModulator.

8.  
A walkie-talkie, where both sides can talk but only one at a time, is an example of:

Correct Answer: C [half-duplex]

Explanation:

Both ways, one at a time = half-duplex.

9.  
Which system translates domain names such as www.example.com into IP addresses?

Correct Answer: C [DNS]

Explanation:

Domain Name System; DHCP gives addresses, ARP finds MAC addresses.

10.  
Which protocol, in its usual setting, downloads e-mail from the server to one device and removes it from the server?

Correct Answer: B [POP3]

Explanation:

POP3 downloads mail to one device and usually deletes it from the server; IMAP keeps it there.

11.  
Which of the following is a web browser?

Correct Answer: D [Mozilla Firefox]

Explanation:

Firefox is a browser; Google Search is a search engine.

12.  
How many layers are there in the OSI reference model?

Correct Answer: B [7]

Explanation:

Seven: Application down to Physical.

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