The diagram below is the network in use:
Switch 3
FA0/1 – DP
FA1/1 – DP
Switch 1
FA1/1 – RP
FA0/1 DP
Switch 2
FA1/1 – RP
FA0/1 – DP
Switch 0
FA0/1 – RP
FA1/1 – ALTN
The lab for this example can be downloaded by clicking here
Spanning Tree Protocol Port Roles
October 1, 2013
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ICND2 Topics, IOS Commands, Networking, Protocols, Switches, Troubleshoot | Tagged: ccna, ccna exam, cisco, cisco ios, cisco networking, cisco switches, hints n tips, icnd2, iOS, ios commands, labs, lan, Microsegmentation, networking, study, switch, switches | 
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Posted by Josh Gahan
Creating A VLAN Step By Step
August 26, 2013Step 1
a. From configuration mode, use the vlan vlan-id global configuration
command to create the VLAN and to move the user into VLAN
configuration mode.
b. (Optional) Use the name name VLAN subcommand to list a name
for the VLAN. If not configured, the VLAN name is VLANZZZZ,
where ZZZZ is the 4-digit decimal VLAN ID.
Step 2 To configure a VLAN for each access interface, follow these steps:
a. Use the interface command to move into interface configuration
mode for each desired interface.
b. Use the switchport access vlan id-number interface subcommand to
specify the VLAN number associated with that interface.
c. (Optional) To disable trunking on that same interface, ensuring that
the interface is an access interface, use the switchport mode access
interface subcommand.
Leave a Comment » | IOS Commands, Networking, Protocols, Switches, VLANs | Tagged: ccna, ccna exam, cisco vlan, icnd2, ios commands, switch vlan, vlan, vlan id, VLAN name, vlan step by step, vlans | Permalink
Posted by Josh Gahan
Switch IP & Default Gateway Checklist
June 7, 2013- Enter VLAN1 configuration mode using the Interface VLAN 1 global configuration command
- Assign an IP address and mask using the IP address ip address mask interface sub-command
- Enable the VLAN1 interface using No shutdown interface subcommand
- Add the IP default-gateway ip address global command to configure the default gateway
Leave a Comment » | IOS Commands, Networking, Security, Switches | Tagged: can exam, ccent, ccent exam, ccna, cisco checklist, cisco cli, cisco routers, cisco switches, command line interface, default gateway, icnd1, icnd2, ios commands, ip address, mask, subnet | Permalink
Posted by Josh Gahan
Port Security
April 28, 2013Switches examine the source MAC address of the received frame, switches can take a few possible options if it discovers that the incoming MAC address on that port is NOT SECURE.
- shutdown (the switch shuts down the port and sends a log message and drops the frame/s , also the interface status will read err-disabled you have to run a no shutdown to open the port again) ON BY DEFAULT
- restrict (drops the frames and transmits a log message but does not shutdown the port)
- protect (only drops the frames)
When configuring Port security and the source MAC address is unknown switchport port-security mac-address sticky can be used and the switch will use the first mac address learned as the Secure MAC address
Leave a Comment » | Networking, Security, Switches | Tagged: advice, ccent, ccent exam, ccna, ccna exam, cent, cisco, cisco hardware, cisco ios, cisco switches, cisco switching, did you know, err-disabled, hints n tips, information technology, iOS, ios commands, it, it security, mac, mac address, networking, packet, port security, protocol, router, security, switches, TCP, transmission control protocol, UDP | Permalink
Posted by Josh Gahan
Basic Switch Security
April 28, 2013Cisco Switch Defaults
- All cisco switch ports are open by (DEFAULT)
- Attempting to trunk (DEFAULT)
- Remember all ports are in VLAN1
Best practice habits should include
- Close Unused ports (shutdown command)
- Stop the port from trunking with (switchport mode access command)
- Place all unused Ports into an unused VLAN
Remember the switches should be locked away in a secure room and or a cabinet
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Posted by Josh Gahan
GNS3 with setup and setting the telnet password
April 24, 2013[youtube http://www.youtube.com/watch?v=rtiDfh-CILs&w=560&h=315]
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Posted by Josh Gahan
Explore The Routing Table
April 23, 2013I have just linked to a video i created on Youtube, it explores the routing table and also shows you how to change from prefix notation to dotted decimal. If you like i will continue to make more. Enjoy!
[youtube http://www.youtube.com/watch?v=pFilJ_Kvo3E&w=420&h=315]
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Posted by Josh Gahan
DCE and Setting the Clock Rate
December 10, 2012
Serial Link
Setting the Clock Rate (CLOCK RATE INTERFACE COMMAND)
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#int serial 1/0
Router(config-if)#clock rate ? (Can be either clockrate or clock rate depending on model)
With the exception of the following standard values not subject to rounding,
1200 2400 4800 9600 14400 19200 28800 38400
56000 64000 128000 2015232
accepted clockrates will be bestfitted (rounded) to the nearest value
supportable by the hardware.
<246-8064000> DCE clock rate (bits per second)
Router(config-if)#clock rate 56000
Router(config-if)#^Z
Remember the DCE Provides the clock rate to the DTE and without this, your line protocol will remain down
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Posted by Josh Gahan