Which of the following is a tool often used to reduce the risk to a local area network (LAN) that has external connections by filtering Ingress and Egress traffic?

The correct answer is A. a firewall. A firewall is the tool specifically designed to reduce risk to a LAN with external connections by filtering both ingress (inbound) and egress (outbound) traffic based on rules such as IP addresses, ports, and protocols. Dial-up is a connectivity method, not a security tool…

Submitted by zhang_li· Apr 18, 2026Network and Communications Security

Question

Which of the following is a tool often used to reduce the risk to a local area network (LAN) that has external connections by filtering Ingress and Egress traffic?

Options

Aa firewall.
Bdial-up.
Cpasswords.
Dfiber optics.

How the community answered

(23 responses)

A
91% (21)
C
4% (1)
D
4% (1)

Explanation

A firewall is the tool specifically designed to reduce risk to a LAN with external connections by filtering both ingress (inbound) and egress (outbound) traffic based on rules such as IP addresses, ports, and protocols. Dial-up is a connectivity method, not a security tool. Passwords authenticate users but do not filter network traffic. Fiber optics is a transmission medium. Firewalls sit at the network boundary and act as gatekeepers, blocking unauthorized traffic in both directions - ingress filtering stops external attacks, while egress filtering prevents data exfiltration.

Topics

#Firewall#Network Security#Traffic Filtering#Perimeter Security

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