Quiz3

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.

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

A computer can access devices on the same network but cannot access devices on other networks. What is the probable cause of this problem?

• • The cable is not connected properly to the NIC.

• • The computer has an invalid IP address.

• • The computer has an incorrect subnet mask.

• • The computer has an invalid default gateway address.

Why is NAT not needed in IPv6?​

• • Because IPv6 has integrated security, there is no need to hide the IPv6 addresses of internal networks.​

• • Any host or user can get a public IPv6 network address because the number of available IPv6 addresses is extremely large.​

• • The problems that are induced by NAT applications are solved because the IPv6 header improves packet handling by intermediate routers.​

• • The end-to-end connectivity problems that are caused by NAT are solved because the number of routes increases with the number of nodes that are connected to the Internet.

What are two services provided by the OSI network layer? (Choose two.)

• • performing error detection

• • routing packets toward the destination

• • encapsulating PDUs from the transport layer

• • placement of frames on the media

Which field in the IPv4 header is used to prevent a packet from traversing a network endlessly?

• • Time-to-Live

• • Sequence Number

• • Acknowledgment Number

• • Differentiated Services

What statement describes the function of the Address Resolution Protocol?

• • ARP is used to discover the IP address of any host on a different network.

• • ARP is used to discover the IP address of any host on the local network.

• • ARP is used to discover the MAC address of any host on a different network.

• • ARP is used to discover the MAC address of any host on the local network.

Which destination address is used in an ARP request frame?

• • 0.0.0.0

• • 255.255.255.255

• • FFFF.FFFF.FFFF

• • AAAA.AAAA.AAAA

What is the aim of an ARP spoofing attack?

• • to flood the network with ARP reply broadcasts

• • to fill switch MAC address tables with bogus addresses

• • to associate IP addresses to the wrong MAC address

• • to overwhelm network hosts with ARP requests