21.Network Layer:Address Mapping,Error Reporting andMulticasting

The IP packet that carries an IGMP packet has a value of _______ in its protocol field.

• 3
• 2
• 1
• none of the above

IGMP is _______ protocol.

• an error reporting
• a group management
• a transmission
• none of the above

If the sender is a host and wants to send a packet to another host on the same network, the logical address that must be mapped to a physical address is ______.

• the destination IP address in the datagram header
• the IP address of the router found in the routing table
• either a or b
• none of the above

The target hardware address on an Ethernet is _______ in an ARP request.

• 0x000000000000
• 0.0.0.0
• variable
• class dependent

If four hosts on a network belong to the same group, a total of _______ sent in response to a general query message.

• one membership report is
• two membership reports are
• three membership reports are
• none of the above

The _______ is used by a router in response to a received leave report.

• general query message
• special query message
• membership report
• none of the above

Which of the following is true about ICMP messages?

• An ICMP error message may be generated for an ICMP error message.
• An ICMP error message may be generated only for the first fragment.
• An ICMP error message may be generated for a multicast datagram.
• none is true

An IGMP packet is carried in an __________ packet.

• UDP
• IP
• Ethernet frame
• none of the above

An IGMP query is sent from a _______ to a _______.

• host; host
• host; router
• router; host or router
• none of the above

In _______, a table associating a logical address with a physical address is updated manually.

• static mapping
• dynamic mapping
• physical mapping
• none of the above