Chapter 6 Network Layer

The Network Layer handles?

• Addressing end devices

• Encapsulation

• Routing

• De-encapsulation

• All of the above

Within a production network, what is the purpose of configuring a switch with a default gateway address?

• A switch must have a default gateway to be accessible by Telnet and SSH.

• Hosts that are connected to the switch can use the switch default gateway address to forward packets to a remote destination.

• The default gateway address is used to forward packets originating from the switch to remote networks.

• It provides a next-hop address for all traffic that flows through the switch.

What are two functions that are provided by the network layer? (Choose two.)

• carrying data between processes that are running on source and destination hosts

• providing end devices with a unique network identifier

• placing data on the network medium

• directing data packets to destination hosts on other networks

• providing dedicated end-to-end connections

When transporting data from real-time applications, such as streaming audio and video, which field in the IPv6 header can be used to inform the routers and switches to maintain the same path for the packets in the same conversation?

• Next Header

• Traffic Class

• Differentiated Services

• Flow Label

Which key combination allows a user to abort setup mode?

• Ctrl-C

• Ctrl-Z

• Ctrl-R

• Ctrl-Shift-6

Which portion of the network layer address does a router use to forward packets?

• host portion

• gateway address

• broadcast address

• network portion

Which value, that is contained in an IPv4 header field, is decremented by each router that receives a packet?

• Header Length

• Time-to-Live

• Fragment Offset

• Differentiated Services

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

During the boot process, where will the router bootstrap program look for the IOS image by default?

• flash

• NVRAM

• RAM

• ROM

How does the network layer use the MTU value?

• The network layer depends on the higher level layers to determine the MTU.

• The network layer depends on the data link layer to set the MTU, and adjusts the speed of transmission to accommodate it.

• To increase speed of delivery, the network layer ignores the MTU.

• The MTU is passed to the network layer by the data link layer.