Cisco Networking/CCENT/Switching
< Cisco Networking | CCENT
This lesson covers switching.
Objectives and Skills
editObjectives and skills for the switching portion of Cisco CCENT certification include:[1]
- Identify basic switching concepts and the operation of Cisco switches
- Collision domains
- Broadcast domains
- Ways to switch
- Store
- Forward
- Cut through
- CAM Table
- Configure and verify initial switch configuration including remote access management
- hostname
- mgmt ip address
- Ip default-gateway
- local user and password
- enable secret password
- console and VTY logins
- exec-timeout
- service password encryption
- copy run start
- Verify network status and switch operation using basic utilities such as
- ping
- telnet
- SSH
Readings
editMultimedia
editExamples
edit- Review Cisco Networking/CCENT/IOS Basics#Global Configuration
- Review Cisco Networking/CCENT/IOS Basics#Password Configuration
- Review Cisco Networking/CCENT/Remote Management#Line Configuration
- Review Cisco Networking/CCENT/Remote Management#Interface Configuration
- Review Cisco Networking/CCENT/Remote Management#SSH Configuration
- Review Cisco Networking/CCENT/IOS Basics#Configuration Management
- Review Cisco Networking/CCENT/Remote Management#Remote Management
Command Sequence
editA command sequence to configure a switch might be similar to the following.
enable configure terminal hostname switch ip domain-name example.com interface vlan 1 ip address 192.168.1.10 255.255.255.0 ip default-gateway 192.168.1.1 username admin password secret line console 0 login local line aux 0 login local line vty 0 4 login local transport input ssh exit enable secret cisco service password-encryption crypto key generate rsa 1024 ip ssh version 2 exit copy run start
Status
editshow arp
editTo display the entries in the Address Resolution Protocol (ARP) table, use the show ip arp command in user EXEC or privileged EXEC mode.[2]
show arp show ip arp
show mac-address-table
editUse the show mac-address-table privileged EXEC command to display the MAC address table.[3]
show mac-address-table
Activities
edit- Configure switch console password security.
- Add an EtherSwitch router to a new GNS3 project and start the device.
- Open the console for the router and practice using the following commands.
enable
configure terminal
hostname
line console 0
password
login
exec-timeout
enable secret
service password-encryption
exit
- Verify the configuration using the following command.
show running-config
- Exit the router console session and open the console again to test the configuration.
- Configure switch vty username and password security.
- Add a second EtherSwitch router to the project above and start the device.
- Add a link to connect the following.
- ESW1 FastEthernet1/1 <-> ESW2 FastEthernet1/1
- Set the following IP addresses and subnet masks.
- ESW1 VLAN 1: 192.168.1.1 255.255.255.0
- ESW2 VLAN 1: 192.168.1.2 255.255.255.0
- Open the console for both routers and practice using the following commands.
enable
configure terminal
username
line vty 0 4
login local
exit
interface vlan 1
ip address
no shutdown
ip default-gateway
- Verify the configuration using the following command on both routers.
show running-config
ping
show arp
show mac-address-table
- Test the configuration using the following command to remotely manage one router from the other.
telnet
- Configure switch SSH access.
- Use the routers from above and practice using the following commands on both routers.
enable
configure terminal
hostname
ip domain-name
crypto key generate rsa
ip ssh version 2
line vty 0 4
transport input ssh
- Verify the configuration using the following command on both routers.
show running-config
- Test the configuration using the following command to verify that telnet access is no longer supported.
telnet
- Test the configuration using the following command to remotely manage one router from the other.
ssh
- Save the configuration using the following command.
copy running-config startup-config
- Use the routers from above and practice using the following commands on both routers.
Lesson Summary
edit- A network switch is a computer networking device that connects devices together on a computer network, by using frame switching to receive, process and forward data to the destination device.[4]
- A network switch forwards data only to one or multiple devices that need to receive it, rather than broadcasting the same data out of each of its ports.[5]
- Switches forward frames through one of three methods: store and forward, cut through, and fragment free.[6]
- Store and forward buffers and verifies each frame before forwarding it.[7]
- Cut through starts forwarding after the frame's destination address is received.[8]
- Fragment free checks the first 64 bytes of the frame, to detect collision errors before forwarding occurs.[9]
- Some switches may support adaptive switching by automatically selecting between the three methods.[10]
- Switch global configuration is similar to router global configuration, including the
enable
,disable
,configure terminal
,exit
,hostname
, andip domain-name
commands. - Switch password configuration is similar to router password configuration, including the
password
,login
,username
,login local
,exec-timeout
,enable password
,enable secret
, andservice password-encryption
commands. - Switch line configuration is similar to router line configuration, including the
show line
andline
commands. - Switch interface configuration is similar to router interface configuration, including the
show ip interface
,show ip interface brief
,interface
,ip address
,shutdown
andno shutdown
commands. - Switch SSH configuration is similar to router SSH configuration, including the
crypto key generate rsa
,ip ssh version
, andtransport input
commands. - Switch configuration management is similar to router configuration management, including the
show running-config
,show startup-config
,copy
,erase
, andreload
commands. - Switch remote management is similar to router remote management, including the
telnet
andssh
commands. - Switch status is tested similar to router status, including the
ping
andtraceroute
commands. - To enable remote management of a switch, assign an IP address to the management VLAN interface, which by default is VLAN 1.[11]
- To define a default gateway (router) when IP routing is disabled, use the
ip default-gateway
command in global configuration mode.[12] - To display the entries in the Address Resolution Protocol (ARP) table, use the
show ip arp
command in user EXEC or privileged EXEC mode.[13] - Use the
show mac-address-table
privileged EXEC command to display the MAC address table.[14]
Key Terms
edit- autonegotiation
- An Ethernet procedure by which two connected devices choose common transmission parameters, such as speed, duplex mode, and flow control.[15]
- flooding
- Sending incoming unknown-destination frames out on all ports.[16]
- Spanning Tree Protocol (STP)
- A network protocol that ensures a loop-free topology for Ethernet networks and allows a network design to include spare (redundant) links to provide automatic backup paths if an active link fails, without the danger of bridge loops, or the need for manual enabling or disabling of these backup links.[17]
Review Questions
edit-
A network switch is _____.A network switch is a computer networking device that connects devices together on a computer network, by using frame switching to receive, process and forward data to the destination device.
-
A network switch forwards data _____.A network switch forwards data only to one or multiple devices that need to receive it, rather than broadcasting the same data out of each of its ports.
-
Switches forward frames through one of three methods: _____, _____, and _____.Switches forward frames through one of three methods: store and forward, cut through, and fragment free.
-
Store and forward _____.Store and forward buffers and verifies each frame before forwarding it.
-
Cut through _____.Cut through starts forwarding after the frame's destination address is received.
-
Fragment free _____.Fragment free checks the first 64 bytes of the frame to detect collision errors before forwarding occurs.
-
Some switches may support adaptive switching by _____.Some switches may support adaptive switching by automatically selecting between the three forwarding methods.
-
Switch global configuration is similar to router global configuration, including the _____ commands.Switch global configuration is similar to router global configuration, including the enable, disable, configure terminal, exit, hostname, and ip domain-name commands.
-
Switch password configuration is similar to router password configuration, including the _____ commands.Switch password configuration is similar to router password configuration, including the password, login, username, login local, exec-timeout,enable password, enable secret, and service password-encryption commands.
-
Switch line configuration is similar to router line configuration, including the _____ commands.Switch line configuration is similar to router line configuration, including the show line and line commands.
-
Switch interface configuration is similar to router interface configuration, including the _____ commands.Switch interface configuration is similar to router interface configuration, including the show ip interface, show ip interface brief, interface,ip address, shutdown and no shutdown commands.
-
Switch SSH configuration is similar to router SSH configuration, including the _____ commands.Switch SSH configuration is similar to router SSH configuration, including the crypto key generate rsa, ip ssh version, and transport input commands.
-
Switch configuration management is similar to router configuration management, including the _____ commands.Switch configuration management is similar to router configuration management, including the show running-config, show startup-config, copy, erase, and reload commands.
-
Switch remote management is similar to router remote management, including the _____ commands.Switch remote management is similar to router remote management, including the telnet and ssh commands.
-
Switch status is tested similar to router status, including the _____ commands.Switch status is tested similar to router status, including the ping and traceroute commands.
-
To enable remote management of a switch, _____.To enable remote management of a switch, assign an IP address to the management VLAN interface, which by default is VLAN 1.
-
To define a default gateway (router) when IP routing is disabled, use _____.To define a default gateway (router) when IP routing is disabled, use the ip default-gateway command in global configuration mode.
-
To display the entries in the Address Resolution Protocol (ARP) table, use _____.To display the entries in the Address Resolution Protocol (ARP) table, use the show ip arp command in user EXEC or privileged EXEC mode.
-
Use the _____ command to display the MAC address table.Use the show mac-address-table privileged EXEC command to display the MAC address table.
Assessments
edit- Flashcards: Quizlet: CCENT - Switching
- Quiz: Quizlet: CCENT - Switching
See Also
editReferences
edit- ↑ Cisco: ICND1 Exam Topics
- ↑ Cisco: IP Addressing Services Command Reference
- ↑ Cisco: Cisco IOS LAN Switching Command Reference
- ↑ Wikipedia: Network switch
- ↑ Wikipedia: Network switch
- ↑ Wikipedia: Network switch
- ↑ Wikipedia: Network switch
- ↑ Wikipedia: Network switch
- ↑ Wikipedia: Network switch
- ↑ Wikipedia: Network switch
- ↑ TechRepublic: Five Things You Should Know About Configuring a Cisco IOS Switch
- ↑ Cisco: IP Addressing Services Command Reference
- ↑ Cisco: IP Addressing Services Command Reference
- ↑ Cisco: Cisco IOS LAN Switching Command Reference
- ↑ Wikipedia: Autonegotiation
- ↑ Wikipedia: MAC flooding
- ↑ Wikipedia: Spanning Tree Protocol