CCNAStudyGuide(3)
添加时间: 2007-9-3 22:52:43 作者: Cisco认证考试 阅读次数:25 来源: http://www.d9soft.com
B Channel is a data channel (56k or 64K). It is used for digitized speech transmission or for relatively high speed data transport. Narrowband ISDN is circuit switched oriented. The B channel is the elemental circuit-switching unit.
ISDN Terminal Equipment Two basic types of equipment
TE1: Specialized ISDN terminal, including computer equipment or telephones. It is used to connect to ISDN through a four wire, twisted pair digital link.
TE2: NON ISDN terminal such as data terminal equipment (DTE) that predates the ISDN standards. A TE2 connects to ISDN through a terminal adapter (TA). An ISDN (TA) can be either a standalone device or a board inside the TE2.
ET:Exchange Termination: This is the local phone company’s logical connection from your telephones to the phone network
ISDN Network Termination Devices Intermediate Devices
NT1: Treated as customer premises equipment (CPE)
NT2: Typically found in digital private branch exchanges (PBXs). At the layer2 and layer3
NT1/2: combined functions of NT1 and NT2
ISDN Reference Point
R: It is between non-ISDN equipment and a TA
S: It is between user terminals and an NT2
T: It is between NT1 and NT2
U: It is between NT1 devices and line termination equipment in a carrier network.
Customer Premise Equipment
Are devices physically located on the subscriber’s premise: Such as telephones and modems.
Demarc
The demarcation point is the junction at which the CPE ends and the local loop portion of the service begins.
DTE and DCE
The WAN physical layer describes the interface between the data terminal equipment DTE and the data circuit terminating equipment DCE. Typically the DCE is the service provider, and the DTE is the attached device.
DTE
Data terminal equipment: Device at the user end of a user network interfaces that serves as a data source, destination or both and connects through a DCE device.
CO Central Office:
Local telephone company office to which all-local loops in a given area connect and in which circuit switching of subscriber.
LMI Local Management Interface:
A signaling standard between the CPE device and FR switch that is responsible for managing the connection and maintaining status between the devices
PAP and CHAP
Router> EXEC Mode
Router# Privileged EXEC Mode
> or rommon > ROM Monitor Mode
Router RXBoot Mode
Router (config)# Global Configuration Mode
Router (config-mode)# Other Configuration Modes
Add RIP to the Router
Router(config-if)# router RIP
The second command specifies which networks to receive rip updates from
Name# network x.x.x.x
Add IGRP protocol to Router
Router(config)# router igrp groupnumber
Router(config)#
Add IPX Routing
Type IPX routing
Task
Command
Diagnose basic network connectivity (user level)
Ping ipx
Diagnose basic network connectivity (privilegedlevel)
Ping [ipx]
Display status of the IPX interface configured in the router and the parameters configured on each interface.
Show ipx interface
List the enteries in the IPX routing table
Show ipx servers
Display information about the number and type of ipx packets transmitted and received.
Show ipx traffic
Help Command
If you don’t know the command for a particular command like clock you type clo? It will finish it for you.
If you don’t know the command then type (?) it must have a space after the word.
To list keywords or arguments, parameters enter a question mark (?) in place of a keyword or argument.
Complete a partial command name. abbreviated-command-entry
List all commands available for a particular command mode. ?
List a command’s associated keywords. command ?
List a keyword’s associated arguments. Command keyword ?
RAM/DRAM: Working storage and contains the dynamic configuration information.
NVRAM: Contains backup copy of your configuration.
Flash memory: Erasable, programmable read only memory. Contains Cisco IOS software.
ROM: Contains an initializing bootstrap program.
- If no configuration file exists, the router will revert to setup mode.
EXEC Mode:
Has two levels User mode and privileged mode
User mode checks the status of router status
Privileged mode: Includes those that change the router configuration
To enter privileged mode type enable
To exit user EXEC mode type logout at the prompt
Global configuration mode
Type configure command at the privileged EXEC mode prompt. To end it use CTRL-Z, end, and exit
Global Configuration mode:
To configure a router it must use the host name of the router.
TAB Will complete the command for you.
Ctrl Move to the beginning of the command line
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