Netacad Chapter 6: Network Layer

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Which key combination allows a user to abort setup mode?

Ctrl-C

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

Time-To-Live (TTL)

What are two functions that are provided by the network layer?

1. providing end devices with a unique network identifier 2. directing data packets to destination hosts on other networks

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

127.0.0.1

A router may have to fragment a packet when forwarding it from one medium to another medium that has a smaller?

Maximum Transmission Unit (MTU)

The acronym used to define the process that allows multiple devices to share a single routable IP address

NAT

The process of modifying the IP packet header information on packets going outside the corporate network

Network Address Translation (NAT)

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

Network Portion

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

The Flash Memory

This field can be used to inform routers and switches to maintain the same path for the packet flow so that packets will not be reordered. (IPv6 Header)

The Flow Label

How does the network layer use the MTU value?

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

If there are two or more possible routes to the same destination what is used to determine which route is used in the routing table?

The Metric

What is the purpose of configuring a switch with a default gateway address?

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


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