Chapter 6

Question 1

Authentication confirms the identity of the user or device. Authorization determines what the user or device is allowed to do. Accounting records information about access attempts, including inappropriate requests.

Answer 1

AAA

Question 2

A server that holds security information and provides services related to user login, particularly authentication (is the user who he says he is?), authorization (once authenticated, what do we allow the user to do?), and accounting (tracking the user).

Answer 2

AAA Server

Question 3

On an IP host, the IP address of some router to which the host sends packets when the packet’s destination address is on a subnet other than the local subnet.

Answer 3

default gateway/default router

Question 4

An application layer protocol used throughout the Internet for translating hostnames into their associated IP addresses.

Answer 4

DNS

Question 5

A part of the Cisco IOS CLI in which the user can use the most powerful and potentially disruptive commands on a router or switch, including the ability to then reach configuration mode and reconfigure the router.

Answer 5

Enable Mode

Question 6

In a Cisco router or switch, the function by which IOS keeps a list of commands that the user has used in this login session, both in EXEC mode and configuration mode. The user can then recall these commands for easier repeating or making small edits and issuing similar commands.

Answer 6

history buffer

Question 7

A username (with matching password), configured on a router or switch. It is considered local because it exists on the router or switch, and not on a remote server.

Answer 7

local username

Question 8

The process by which an IP host discovers the IP address associated with a hostname, often involving sending a DNS request to a DNS server, with the server supplying the IP address used by a host with the listed hostname.

Answer 8

name resolution

Question 9

A TCP/IP application layer protocol that supports terminal emulation between a client and server, using dynamic key exchange and encryption to keep the communications private.

Answer 9

Secure Shell (SSH)

Question 10

The standard terminal-emulation application layer protocol in the TCP/IP protocol stack. Used for remote terminal connection, enabling users to log in to remote systems and use resources as if they were connected to a local system.

Answer 10

Telnet

Question 11

A configuration concept inside Cisco switches, used as an interface between IOS running on the switch and a VLAN supported inside the switch, so that the switch can assign an IP address and send IP packets into that VLAN.

Answer 11

VLAN interface