Cisco 200-105 Exam

What can be done to Frame Relay to resolve split-horizon issues? (Choose two.)

  • A. Disable Inverse ARP.
  • B. Create a full-mesh topology.
  • C. Develop multipoint subinterfaces.
  • D. Configure point-to-point subinterfaces.
  • E. Remove the broadcast keyword from the frame-relay map command.
Answer: Option B. D.
Explanation: 

IP split horizon checking is disabled by default for Frame Relay encapsulation to allow routing updates to go in and out of the same interface. An exception is the
Enhanced Interior Gateway Routing Protocol (EIGRP) for which split horizon must be explicitly disabled. Certain protocols such as AppleTalk, transparent bridging, and Internetwork Packet Exchange (IPX) cannot be supported on partially meshed networks because they require split horizon to be enabled (a packet received on an interface cannot be transmitted over the same interface, even if the packet is received and transmitted on different virtual circuits). Configuring Frame Relay subinterfaces ensures that a single physical interface is treated as multiple virtual interfaces. This capability allows you to overcome split horizon rules so packets received on one virtual interface can be forwarded to another virtual interface, even if they are configured on the same physical interface.

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