ITN Modules 8-11

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 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 directly to the destination host.

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

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

• route the packet out the Gigabit 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

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 invalid default gateway address

• The computer has an incorrect subnet mask.

The image shows a small switched network and the contents of the MAC address table of the switch. PC1 has sent a frame addressed to PC3. What will the switch do with the frame?

• The switch will discard the frame.

• The switch will forward the frame only to port 2.

• The switch will forward the frame to all ports except port 4.

• The switch will forward the frame to all ports.

• The switch will forward the frame only to ports 1 and 3.

Which statement describes a feature of the IP protocol?

• IP encapsulation is modified based on network media.
• IP relies on Layer 2 protocols for transmission error control.
• MAC addresses are used during the IP packet encapsulation.
• IP relies on upper layer services to handle situations of missing or out-of-order packets.

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.

Which parameter does the router use to choose the path to the destination when there are multiple routes available?

• the lower metric value that is associated with the destination network
• the lower gateway IP address to get to the destination network
• the higher metric value that is associated with the destination network
• the higher gateway IP address to get to the destination network

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
• collision detection