CCNA1 - CH 6 Network Layer Review

Which of the following describes the ability of the network layer of the OSI model to carry packets for different types of communications and hosts?

• the de-encapsulation of headers from lower layers

• the selection of paths for and direct packets toward the destination

• the ability to operate without regard to the data that is carried in each packet

• the ability to manage the data transport between processes running on hosts

Of the following options, which to are characteristics of the Internet Protocol (IP)?

• does not require a dedicated end-to-end connection

• operates independently of the network media

• retransmits packets if errors occur

• re-assembles out of order packets into the correct order at the receiver end

• guarantees delivery of packets

How is missing data detected and retransmitted when a connectionless protocol is used at lower layers of the OSI model?

• Connectionless ack packets are used to request retransmission

• Protocols at higher layers that are connection-oriented track, and request data if necessary, from the sending host

• IP manages the communication session if connection-oriented transport services are not available

• Best-effort delivery processes guarantee all packets are sent and received accordingly

In an IPv4 header, which field identifies the upper layer protocol carried in the packet?

• Protocol

• Identification

• Version

• Differentiated Services

You have typed in show ip route on a router, and are now looking at the IPv 4 routing table of the router. What does the letter C next to an entry indicate?

• static route

• default route

• directly connected route

• dynamic route that has been learned from EIGRP

Which routing table entry has a next hop address associated with a destination network?

• directly-connected routes

• local routes

• remote routes

• C and L source routes

Which of the following represent router interfaces? (Select two.)

• SVI

• DHCP

• Telnet

• WAN

• LAN

During normal operation, what information is kept in a routers RAM?

• Cisco IOS

• backup IOS file

• basic diagnostic software

• startup configuration file

• IP routing table

Which of the following is the reason a router would enter setup mode when it boots?

• The IOS image is corrupt

• Cisco IOS is missing from flash memory

• The Configuration file is missing from NVRAM

• The POST process has detected hardware failure.

Which field of an IPv4 header defines the priority of the packet?

• flow label

• flags

• differentiated services

• traffic class