Chapter 8

Which information is used by routers to forward a data packet toward its destination?

• source IP address

• destination IP address

• source data link address

• destination data link address

A computer has to send a packet to a destination host in the same LAN. How will the packet be sent?

• The packet will be sent to the default gateway first, and then, depending on the response from the gateway, it may be sent to the destination host.

• The packet will be sent directly to the destination host.

• The packet will first be sent to the default gateway, and then from the default gateway it will be sent directly to the destination host.

• The packet will be sent only to the default gateway.

A router receives a packet from the Gigabit Ethernet 0/0/0 interface and determines that the packet needs to be forwarded out the Gigabit Ethernet 0/0/1 interface. What will the router do next?

• route the packet out the Gigabit Ethernet 0/0/1 interface

• create a new Layer 2 Ethernet frame to be sent to the destination

• look into the ARP cache to determine the destination IP address

• look into the routing table to determine if the destination network is in the routing table

Which IPv4 address can a host use to ping the loopback interface?

• 126.0.0.1

• 127.0.0.0

• 126.0.0.0

• 127.0.0.1

When a connectionless protocol is in use at a lower layer of the OSI model, how is missing data detected and retransmitted if necessary?

• Connectionless acknowledgments are used to request retransmission.

• An upper-layer connection-oriented protocol keeps track of the data received and can request retransmission from the upper-level protocol on the sending host.

• Network layer IP protocols manage the communication sessions if connection-oriented transport services are not available.

• The best-effort delivery process guarantees that all packets that are sent are received.

What was the main reason for the creation and implementation of IPv6?

• to make reading a 32-bit address easier

• to address the IPv4 address depletion problem

• to provide more address space in the Internet Names Registry

• to allow NAT support for private addressing

Which statement accurately describes a characteristic of IPv4?

• All IPv4 addresses are assignable to hosts.

• IPv4 has a 32-bit address space.

• An IPv4 header has fewer fields than an IPv6 header has.

• IPv4 has a 128-bit address space.

When a router receives an IPv6 packet, what information is examined in order to see if the packet has exceeded the number of routers that can forward the packet?

• destination IP address

• source IP address

• hop limit

• TTL

Which field in an IPv6 packet does a router use to determine whether the packet has expired and should be dropped?

• TTL

• Hop Limit

• Address Unreachable

• No Route to Destination

Which command can be used on a Windows host to display the routing table?

• netstat -s

• show ip route

• netstat -r

• print route