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CCNA Semester 2
Chapter 1 Intro to Routing and Packet Forwarding
90
Computer Networking
Undergraduate 1
01/19/2013

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Cards

Term
What does a router connect?
Definition
Multiple networks
Term
What does a router do with each packet it receives?
Definition
It determines which interface to use and forwards the packet on towards its destination
Term
What are the 2 types of connections to a router interface?
Definition
LAN Local Area Network
WAN Wide Area Network
Term
What are the two primary functions of a router?
Definition
Best Path Determination
Forwarding packets toward their destination
Term
What address does the router use to compare to the routing table?
Definition
Destination IP addresss
Term
What two processes are used by a router to learn about remote networks and build their routing tables?
Definition
Static Routes
Dynamic Routing Protocols
Term
List the 5 different components stored in RAM.
Definition
Operating System, Running Configuration File, IP Routing Table, ARP Cache, Packet Buffer
Term
What happens to the information in RAM if the router looses power?
Definition
All information is lost
Term
What are the permanent storage areas in a router?
Definition
ROM, Flash, and NVRAM
Term
What 3 things are stored in ROM?
Definition
The bootstrap instructions
Basic diagnostic software
Scaled-down version of IOS.
Term
What is stored in flash?
Definition
Cisco IOS
Term
What happens to flash memory when the power is lost?
Definition
Nothing
Term
What is stored in NVRAM?
Definition
Startup configuration file
Term
What must you do to save changes you have made to a router?
Definition
Copy the running-config to the startup-config
Term
What is the first thing that happens as the router boots up?
Definition
The startup config is copied into RAM
Term
What are the 4 phases of the bootup process?
Definition
1. Performing the POST
2. Loading the bootstrap program
3. Locating and loading the Cisco IOS software
4. Locating and loading the startup configuration file or entering setup mode
Term
What does POST test?
Definition
The router hardware
Term
What is the main function of the bootstrap program?
Definition
Find and load the IOS
Term
What are the 2 main places to find the IOS?
Definition
Flash and TFTP server
Term
If a full IOS can not be loaded what does the bootstrap loader do?
Definition
Loads a scaled down version of the IOS from ROM to RAM
Term
Where is the startup configuration found?
Definition
NVRAM
Term
What are the main items stored in the configuration file?
Definition
interface addresses
routing information
passwords
any other configurations saved by the network administrator
Term
Where is the second place that the router looks for the startup config if it is not located in NVRAM?
Definition
TFTP server
Term
If the router can not locate a startup-config, what mode does it enter?
Definition
Setup mode
Term
What key command do you press to exit setup mode if you accidentally entered it?
Definition
Ctrl-C
Term
What command can be used to help verify and troubleshoot some of the basic hardware and software components of the router?
Definition
R1#Show version
Term
What is the last line displayed in the show version output?
Definition
Configuration register
Term
What is the default configuration register setting?
Definition
0x2102
Term
What does that setting tell the router?
Definition
attempt to load a Cisco IOS software image from flash memory and load the startup configuration file from NVRAM
Term
What are the two management ports?
Definition
Console and auxiliary
Term
What is an interface?
Definition
physical connector on the router whose main purpose is to receive and forward packets
Term
What must be configured for each interface?
Definition
Each interface must be configured with an IP address and subnet mask of a different network
Term
What OSI layer does a router operate at?
Definition
Layer 3
Term
What is the router interface that connects to a LAN called?
Definition
Default Gateway
Term
What is the process that each router uses to determine where to send the packet?
Definition
decapsulation, searching the routing table, and then re-encapsulation
Term
What are the four essential information elements to include in the topology diagram?
Definition
Device names
Interfaces used in the design
IP addresses and subnet masks
Default gateway addresses for end devices, such as PCs
Term
What are the basic tasks to perform when configuring a router?
Definition
Naming the router
Setting passwords
Configuring interfaces
Configuring a banner
Saving changes on a router
Verifying basic configuration and router operations
Term
What is the prompt for the user mode?
Definition
Router>
Term
What is the command to enter the privileged EXEC mode?
Definition
Enable
Term
What is the prompt for privileged EXEC mode?
Definition
Router#
Term
What is the command to enter the global configuration mode?
Definition
Router#config t
Term
What is the command to enter the hostname of a router?
Definition
Router(config)#hostname R1
Term
What happens to the prompt after you press enter?
Definition
The prompt changes to the hostname
Term
What is the command used to enter the password to enter the privileged EXEC mode?
Definition
R1(config) enable secret class
Term
List the commands to set the password for the console port
Definition
R1(config)#line console 0
R1(config-line)#password cisco
R1(config-line)#login
Term
List the commands to set the password for the Telnet lines?
Definition
R1(config)#line vty 0 4
R1(config-line)#password cisco
R1(config-line)#login
Term
List the commands to enter the Banner Message of the Day (motd).
Definition
R1(config)#banner motd #
Enter TEXT message. End with the character '#'.
******************************************
WARNING!! Unauthorized Access Prohibited!!
******************************************
#
Term
What is the command to enter the interface configuration mode?
Definition
R1(config)#interface Serial0/0
Term
What is the command to set the IP address and subnet mask for an interface?
Definition
R1(config-if)#ip address 192.168.2.1 255.255.255.0
Term
What is the command to enter a description for the interface?
Definition
Router(config-if)#description Ciruit#VBN32696-123 (help desk:1-800-555-1234)
Term
What is the command to turn on an interface?
Definition
Router(config-if)#no shutdown
Term
What is the command to view the running-configuration file?
Definition
R1#show running-config
Term
What is the command to save the current config in NVRAM?
Definition
R1#copy running-config startup-config
Term
What command will display the routing table?
Definition
R1#show ip route
Term
What command displays all of the interface configuration parameters and statistics?
Definition
R1#show interfaces
Term
What command displays abbreviated interface configuration information, including IP address and interface status?
Definition
R1#show ip interface brief
Term
Where is the routing table stored?
Definition
RAM
Term
What is a directly connected network?
Definition
a network that is directly attached to one of the router interfaces
Term
What is a remote network?
Definition
a network that is not directly connected to the router
Term
What would a C in the first column of a routing table mean?
Definition
Directly connected
Term
What additional information is included when the destination is a remote network?
Definition
the routing metric and the administrative distance
Term
What command reveals the configured or acquired default gateway, connected, loopback, multicast, and broadcast networks?
Definition
Route print
Term
How does a PC determine which network it belongs to?
Definition
uses the subnet mask
Term
What command will activate a router interface?
Definition
Router(config-if)#no shutdown
Term
What routes does a router know before any static or dynamic routing is configured?
Definition
Directly connected networks
Term
What denotes a static route in the routing table?
Definition
S
Term
What are the three items that must be included in a static route?
Definition
Network address and subnet mask of the remote network
IP address of the next hop router or the exit interface
Term
When should static routes be used?
Definition
Network consists of only a few routers
A network is connected to the Internet through a single ISP
A large network is configured in a hub-and-spoke topology
Term
What are dynamic routing protocols used for?
Definition
share information about the reachability and status of remote networks
Term
What are 2 of the activities that dynamic routing protocols perform?
Definition
Network discovery
Updating and maintaining routing tables
Term
What is network discovery?
Definition
the ability of a routing protocol to share information about the networks that it knows about with other routers that are also using the same routing protocol
Term
What are some dynamic routing protocols?
Definition
RIP (Routing Information Protocol)
IGRP (Interior Gateway Routing Protocol)
EIGRP (Enhanced Interior Gateway Routing Protocol)
OSPF (Open Shortest Path First)
IS-IS (Intermediate System-to-Intermediate System)
BGP (Border Gateway Protocol)
Term
What are the three routing principles?
Definition
1. Every router makes its decision alone, based on the information it has in its own routing table.
2. The fact that one router has certain information in its routing table does not mean that other routers have the same information.
3. Routing information about a path from one network to another does not provide routing information about the reverse, or return, path.
Term
What is asymmetric routing?
Definition
A packet can take different routes to and from
Term
What does a router compare to select the best path to place in the routing table?
Definition
Routing metric
Term
What is a metric?
Definition
the quantitative value used to measure the distance to a given route
Term
The number of routers that a packet must travel through before reaching its destination is called?
Definition
Hop count
Term
The data capacity of a link, sometimes referred to as the speed of the link?
Definition
Bandwidth
Term
What is it called when two paths to a destination have exactly the same metric?
Definition
Equal cost metric
Term
What is equal cost load balancing?
Definition
When a router can use multiple interfaces to reach a single network address.
Term
What is the process used by a router to accept a packet on one interface and forward it out another interface called?
Definition
Switching
Term
What are the three major steps a router performs on a packet?
Definition
1. Decapsulates the Layer 3 packet by removing the Layer 2 frame header and trailer.
2. Examines the destination IP address of the IP packet to find the best path in the routing table.
3. Encapsulates Layer 3 packet into a new Layer 2 frame and forwards the frame out the exit interface.
Term
What happens to the value of the TTL as a packet moves through a network?
Definition
It is decremented each hop. Goes down
Term
Which address does not change as the packet moves through the network?
Definition
IP address
Term
Which address changes as the packet moves through the network?
Definition
MAC address
Term
How does a PC determine which network it belongs to?
Definition
It IP address and subnet mask
Term
How does it determine if the destination is on the same network?
Definition
After Anding the packet it compares the network address to its own
Term
Where does the PC send the packet if the destination is not on its own network?
Definition
To the default gateway
Term
Where does the PC look for the default gateway MAC address?
Definition
In its ARP table
Term
What does the PC do if the MAC address is not in the ARP table?
Definition
It sends an ARP request
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