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Cisco Tips & Tricks - Your Guide: June 2012

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Cisco Tips and Tricks - Your Guide. Friday, June 22, 2012. ROUTER - A Introduction. THERE ARE 7 MAJOR INTERNAL COMPONENTS OF A ROUTER:. CISCO ROUTERS (AND SWITCHES) GENERALLY CONTAIN FOUR TYPES OF MEMORY:. ROM Contains A Bootstrap Program Called ROM Monitor (Or ROMMON). When A Router Is Powered On, The Bootstrap Runs A Hardware Diagnostic Called POST (Power-On Self Test). ROUTER COMPONENTS AND THEIR FUNCTIONS:. RANDOM ACCESS MEMORY (RAM) -. READ-ONLY MEMORY (ROM) -. NON-VOLATILE RAM (NVRAM) -. Stores Sta...

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Cisco Tips & Tricks - Your Guide: Router Boot Order of Operations

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Cisco Tips and Tricks - Your Guide. Thursday, June 21, 2012. Router Boot Order of Operations. Booting up the Router. Cisco routers can boot Cisco IOS software from. 3 ROM (not full Cisco IOS). Normally its booted from Flash RAM. But if it fails, it trys to load IOS from tftp server. If this also fails, it boots a "small" ios which is in ROM. Default boot sequence for Cisco IOS software:. 1 NVRAM (check config-register). 2 FLASH (load IOS). 3 TFTP (boot IOS from tftp if FLASH fails). 0 = ROM Monitor mode.

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Cisco Tips & Tricks - Your Guide: What are the Basics of a Cisco Router?

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Cisco Tips and Tricks - Your Guide. Friday, June 22, 2012. What are the Basics of a Cisco Router? A Router is a layer 3 network device that transmits data between different network segments and can use a packet header to determine the best path for the packet to travel. Routers can connect network sections that use different protocols. They also allow all users in a network to share a single connection to the Internet or a wide area network (WAN). Random Access Memory (RAM). A router can be configured ov...

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Cisco Tips & Tricks - Your Guide: Network Broadcast - How packet will travel in network

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Cisco Tips and Tricks - Your Guide. Thursday, June 21, 2012. Network Broadcast - How packet will travel in network. The term "Broadcast" is used very frequently in the networking world . You will see it in most networking books and articles, or see it happening on your hub/switch when all the LED's start flashing at the same time! The picture below illustrates a router which has sent a broadcast to all devices on its network:. But what does a "broadcast" look like? The screenshot below was taken from the...

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Cisco Tips & Tricks - Your Guide: Fibre Optic Cables

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Cisco Tips and Tricks - Your Guide. Thursday, June 21, 2012. In the 1950's more research and development into the transmission of visible images through optical fibres led to some success in the medical world where it was being used in remote illumination and viewing instruments. In 1966 Charles Kao and George Hockham proposed the transmission of information over glass fibre and realised that to make it a practical proposition, much lower losses in the cables were essential. There are many different type...

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Cisco Tips & Tricks - Your Guide: Static VLANs

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Cisco Tips and Tricks - Your Guide. Thursday, June 21, 2012. VLANs are usually created by the network administrator, assigning each port of every switch to a VLAN. Depending on the network infrastructure and security policies, the assignment of VLANs can be implemented using two different methods: Static or Dynamic memberships - these two methods are also known as VLAN memberships. The picture below depicts an illustration of the above, where 4 ports have been configured for 4 different VLANs:. At this p...

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Cisco Tips & Tricks - Your Guide: Managing a Cisco Internetwork

http://ciscoforyou.blogspot.com/2012/06/managing-cisco-internetwork.html

Cisco Tips and Tricks - Your Guide. Thursday, June 21, 2012. Managing a Cisco Internetwork. Cisco Router Components - Bootstrap, POST, ROM Monitor (all in ROM); Mini-IOS (RXBOOT, or bootloader), RAM, ROM, Flash, NVRAM, Configuration register. Cisco Router Boot Sequence - POST; Bootstrap loads the IOS; the IOS loads a configuration ("startup-config", if present in NVRAM). Configuration register common values in bits (and hex):. 0-3 - 0x0000-0x000F - Boot field, as follows:. 7 - 0x0080 - OEM bit enabled.

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Cisco Tips & Tricks - Your Guide: Difference Between IP and Port

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Cisco Tips and Tricks - Your Guide. Thursday, June 21, 2012. Difference Between IP and Port. With the latest developments of information and communication technologies (ICT) every nook and corner of the vast globe is interconnected. The basis of this wonderful victory is mainly due to rapidly evolving communication and networking technologies. The building blocks of these miracle creations are based upon the concepts of IP addressing and ports. Eg: Class A= For few networks , each with many hosts. One of...

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Cisco Tips & Tricks - Your Guide: DNS Queries & Resolution Process

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Cisco Tips and Tricks - Your Guide. Thursday, June 21, 2012. DNS Queries and Resolution Process. This section will help you understand how the DNS queries work on the Internet and your home network. There are two ways to use the domain name system in order to resolve a host or domain name to an IP Address and we're going to look at them here. There is also a detailed example later on this page to help you understand it better. The DNS Query/Response Message Format pages contain all this packet analysis i...

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Cisco Tips & Tricks - Your Guide: Static Vs Dynamic Vlan

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Cisco Tips and Tricks - Your Guide. Thursday, June 21, 2012. Static Vs Dynamic Vlan. Static VLAN vs Dynamic VLAN. What is Static VLAN? What is Dynamic VLAN? What is the difference between Static VLAN and Dynamic VLAN? Posted by Hardware and Networking Tips. Subscribe to: Post Comments (Atom). Cisco Router 1700 Series. Cisco Router 1800 Series. Cisco Router 2600 Series. Cisco Router 2800 Series. Hardware and Networking Tips. ROUTER - A Introduction. What are the Basics of a Cisco Router? How to recover th...