The following is a list of the information that a DHCP server will share with hosts.
- Host IP address
- Subnet Mask
- Default Gateway
- IP Address(es) of any DNS servers
Dynamic Host Control Protocol (DHCP)
DHCP – Information That it Shares
May 14, 2013
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Posted by Josh Gahan
Fast Fact 1
May 12, 2013Routers break up broadcast domains.
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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
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DHCP & DORA
April 24, 2013DHCP will supply the following 4 pieces of information
- IP address
- Default Gateway
- DNS Server
- Subnet Information
DHCP Process (DORA)
- Discover
- Offer
- Request
- Acknowledgement
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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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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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Microsegmentation
November 5, 2012Microsegmentation is a term used by Cisco when they are talking about one host with one collision domain. Which is what happens when you connect a host to a switch port.
Does anyone want pictures as well … ?
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Did You Know ?
October 14, 2012All ports below 1024 are RESERVED
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Posted by Josh Gahan