3.15. Answers to Review Questions

  1. C. Routers can be configured in many instances to act as packet-filtering firewalls. When configured properly, they can prevent unauthorized ports from being opened.

  2. A. Packet filters prevent unauthorized packets from entering or leaving a network. Packet filters are a type of firewall that block specified port traffic.

  3. D. Routers store information about network destinations in routing tables. Routing tables contain information about known hosts on both sides of the router.

  4. B. Switches create virtual circuits between systems in a network. These virtual circuits are somewhat private and reduce network traffic when used.

  5. B. Many modern PBX (private branch exchange) systems integrate voice and data onto a single data ...

Get CompTIA Security+™ Deluxe: Study Guide now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.