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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
Given the configuration example: