Certified Information Systems Security Professional (CISSP) — Question 408

Which Wide Area Network (WAN) technology requires the first router in the path to determine the full path the packet will travel, removing the need for other routers in the path to make independent determinations?

Answer options

• A. Synchronous Optical Networking (SONET)
• B. Multiprotocol Label Switching (MPLS)
• C. Fiber Channel Over Ethernet (FCoE)
• D. Session Initiation Protocol (SIP)

Correct answer: B

Explanation

The correct answer is B, Multiprotocol Label Switching (MPLS), because it allows the first router to label the packets and establish a predetermined path, which streamlines the routing process. The other options, such as A (SONET), C (FCoE), and D (SIP), do not operate on this principle of path determination by the first router and instead focus on different aspects of network communication.