Which of the following interconnects multiple networks together?

A.
A router

B.
A gateway

C.
A bridge

D.
A firewall

Explanation:
A router connects multiple networks together to form an internetwork.
Incorrect
Answers:
B: A gateway is a hardware and software combination that connects two dissimilar wired

network environments.
C: A bridge connects two similar wired network segments together.
D: A firewall prevents attackers on the Internet from direct access to LAN computers.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 11, 16-18.
David Groth and Toby Skandier, Network+ Study Guide (4th Edition), Sybex, Alameda CA, 2005, pp. 33, 36-37.