What are two characteristics of Frame Relay point-to-point subinterfaces? (Choose two.)
Click on the arrows to vote for the correct answerA. B. C. D. E.
Frame Relay is a high-performance WAN protocol used to connect remote sites within a network. In Frame Relay, subinterfaces are used to split a physical interface into multiple logical interfaces to support multiple virtual circuits. Frame Relay point-to-point subinterfaces are used to connect two routers together, emulating a leased line. Here are the characteristics of Frame Relay point-to-point subinterfaces:
They emulate leased lines: Frame Relay point-to-point subinterfaces emulate a leased line between two endpoints. The connection is permanent, and there is no need to establish a connection each time data needs to be transmitted. The connection is always on, providing a reliable and dedicated connection between two routers.
They require a unique subnet within a routing domain: Each Frame Relay point-to-point subinterface requires a unique IP subnet within a routing domain. The subnet is used to identify the connection between the two routers and to enable routing between them. The routing protocol used on the Frame Relay network must support the use of subnets.
Option A is incorrect because Frame Relay point-to-point subinterfaces do not create split-horizon issues. Split horizon is a technique used to prevent routing loops by not advertising a route back to the router that originally advertised it.
Option D is incorrect because Frame Relay point-to-point subinterfaces are not ideal for full-mesh topologies. Full-mesh topologies require a direct connection between every router, which is not practical or cost-effective in large networks. Frame Relay point-to-point subinterfaces are typically used to connect two routers together.
Option E is incorrect because Frame Relay point-to-point subinterfaces do not require the use of NBMA (Non-Broadcast Multi-Access) options when using OSPF (Open Shortest Path First). NBMA options are used to enable OSPF to function on non-broadcast networks, such as Frame Relay networks with point-to-multipoint connections. However, Frame Relay point-to-point subinterfaces are considered point-to-point connections, and OSPF can function without the use of NBMA options.
Therefore, the correct answers are B and C.