Given the configuration example

640 - 607

Explanation: Tunneling is the process whereby a router encapsulates one Layer 3 protocol inside another protocol (typically IP) for transport across a network to another router. The receiving router de-encapsulates the packet, leaving the original packet.

Incorrect Answers:

A is incorrect; bridging occurs within the same collision domain.

C is incorrect; data link control has nothing to do within communication between networks.

D is incorrect; generic routing is not the Cisco term used for communication between networks. E is incorrect; packet switching refers to WAN communication.

Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 12-14.

Q. 58

What is the protocol and what is the purpose of the following address?

238.255.255.255

A.IPX; a SAP broadcast

B.IP; a multicast address

C.IP; a reserved address

D.IP; a directed broadcast

E.IPX; a flooded broadcast

Answer: B

Explanation: Class D addresses (multicast addresses) include the following range of network numbers: 224.0.0.0 to 239.255.255.255. 238.255.255.255 is within this range.

Incorrect Answers:

A is incorrect; this is not an IPX address.

C is incorrect; Class E addresses (research addresses and sometimes called reserved) include the following range of network numbers: 240.0.0.0 to 247.255.255.255.

D is incorrect; an IP directed broadcast would include the first 3 octets of the IP address and 255 would replace the fourth octet.

F is incorrect; this is not an IPX address.

Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 223-224.

Q. 59