Question

1. what is a firewall?

hardware and/or software that allows hackers in
hardware and/or software that blocks wanted files
hardware and/or software that blocks unwanted traffic
hardware and/or software that allows virus attacks

1. what does the acronym lan stand for?

login and network
local and new
local area network
large area network

Explanation:

1. A firewall is a security measure. Its main function is to monitor and control incoming and outgoing network traffic. It blocks unwanted traffic (such as malicious network access attempts) while allowing legitimate traffic. Option 1 ("allows hackers in") and option 4 ("allows virus attacks") are incorrect as they are contrary to the purpose of a firewall. Option 2 ("blocks wanted files") is also wrong because a firewall focuses on traffic (network communication) rather than specific wanted files in a general sense.
2. LAN is a well - known networking term. "Local area network" is the standard definition. Option 1 ("login and network") and option 2 ("local and new") are not correct as they do not match the established meaning. Option 4 ("large area network") is incorrect because the correct term for a large - scale network is WAN (Wide Area Network).

Answer:

1. hardware and/or software that blocks unwanted traffic
2. local area network