Like annoyed if you want the router configuration lab, it turns out the router in the password? and pasword do not know? Never fear, there is no problem that there is no way out. Usually if the practicum in cisco networking academy, the password used if not "cisco" must have "class". Sometimes there's just a fun student wishes to change the password dewe. As a result, a friend who would practicum on the next turn on the dither because the router password. Here's the trick to perform password recovery.
* Build the console session with the router
* Enable hyperterminal (terminal emulation) on the PC
* Make sure the console has been connected with
* Turn on the router
* Press "Ctrl + Break" on the PC connected to the console
* Ensure the hyperterminal appear rommon>
* Then type the confreg 0 × 2142
* After typing reset
Display rommon> show routers work on the rom monitor mode of operation. Confreg command 0 × 2142 aims to change the configuration register value is 0 × 2142, where the value will make the router bypass reading configuration files in NVRAM, so that the configuration password is not legible. Reset command will make the router reset and do a startup again. Well now you can start the configuration without having to enter a password.
Do not forget after the router to boot normally, change the configuration register value back to 0 × 2102. Good luck.
2011-08-21
Link State Routing Protocols
On this occasion we will discuss about the link-state routing protocols. But before we review the back of distance vector protocols and the difference is with a link-state routing protocols. To illustrate the difference in distance vector routing protocols and link state we can use an analogy. In distance vector analogous to a road signs that guide us in our journey towards the goal, where the information contained only distance and direction. In link state, routing protocol analogous to a map. With a map we can see all the potential routes and determine their own path that we want most.
Distance vector routing protocols such as road signs because the router must make decisions based on the most desirable path of a distance or metric into a network. Just as travelers trust a signpost that shows the exact directions to the next town, a distance vector router to believe that other routers have to inform the proper distance to the destination network.
Link-state routing protocol uses another approach. Link-state routing protocol is more like a road map because they make a map of the topology of a network and each router uses this map to determine the shortest path to each network. Similarly, when we refer to a map to find routes to other cities, router-router link-state using a map to determine the most desirable path to achieve the other goals.
Routers that run a link-state routing protocols send information about the status of its link to other routers in the routing area. Status of this link refers to the network that connects directly to him and include information about the types of networks and neighboring routers on the network, so-called link-state routing protocol.
Link-state routing protocol is also known as shortest path first protocol and is built on the shortest path first algorithm Edsger Dijkstra's.
Routing protocols are link-stater IP:
* Open Shortest Path First (OSPF)
* Intermediate System to Intermediate System (IS-IS)
Distance vector routing protocols such as road signs because the router must make decisions based on the most desirable path of a distance or metric into a network. Just as travelers trust a signpost that shows the exact directions to the next town, a distance vector router to believe that other routers have to inform the proper distance to the destination network.
Link-state routing protocol uses another approach. Link-state routing protocol is more like a road map because they make a map of the topology of a network and each router uses this map to determine the shortest path to each network. Similarly, when we refer to a map to find routes to other cities, router-router link-state using a map to determine the most desirable path to achieve the other goals.
Routers that run a link-state routing protocols send information about the status of its link to other routers in the routing area. Status of this link refers to the network that connects directly to him and include information about the types of networks and neighboring routers on the network, so-called link-state routing protocol.
Link-state routing protocol is also known as shortest path first protocol and is built on the shortest path first algorithm Edsger Dijkstra's.
Routing protocols are link-stater IP:
* Open Shortest Path First (OSPF)
* Intermediate System to Intermediate System (IS-IS)
2011-08-04
Introduction to VLAN (Virtual Local Area Network)
A VLAN allows an Administrator to create a group of logic devices that are connected to each other. With VLAN, we can divide the network switch to logically by function, department or project team.VLANs are a small part of a separate IP network logically. VLANs allow multiple IP networks and smaller networks (subnets) within the same switched network switched. In order for computers to communicate on the same VLAN, each computer must have an IP address and Subnet Mask corresponding to the VLAN. Switches must be configured with a VLAN and every port in the VLAN must be registered to a VLAN. A switch port that has been configured with a single VLAN is referred to as an access port.The advantages of a VLANApplication of a VLAN technology allows a network to be more flexible to support business goals. Here are some advantages of using VLANs:
• Security-Department who have sensitive data separate from the existing network, would reduce the chances of breach of access to confidential and important information.• Cost reduction - the cost savings resulting from not need an expensive cost for network upgrades and efficient use of available bandwidth and uplink.• Higher performance - With a split layer 2 network into multiple logical worksgroup (broadcast domain) to reduce unnecessary traffic on the network and improve performance.• Broadcast storm mitigation - By dividing a network into VLANs reduce the amount of equipment that participate in the broadcast storm.• Improved IT staff efficiency - With VLAN network management easier, because users with the needs of the same network share the same VLAN.• Simpler project or application management - Having separate functions simplify the management of a project or work with specific applications.
Sources:LAN Switching and Wireless, CCNA Exploration 4.0, Cisco Systems, 2007.
• Security-Department who have sensitive data separate from the existing network, would reduce the chances of breach of access to confidential and important information.• Cost reduction - the cost savings resulting from not need an expensive cost for network upgrades and efficient use of available bandwidth and uplink.• Higher performance - With a split layer 2 network into multiple logical worksgroup (broadcast domain) to reduce unnecessary traffic on the network and improve performance.• Broadcast storm mitigation - By dividing a network into VLANs reduce the amount of equipment that participate in the broadcast storm.• Improved IT staff efficiency - With VLAN network management easier, because users with the needs of the same network share the same VLAN.• Simpler project or application management - Having separate functions simplify the management of a project or work with specific applications.
Sources:LAN Switching and Wireless, CCNA Exploration 4.0, Cisco Systems, 2007.
Calculate the Network ID (Identity Network)
Network ID (Identity Network) is an address is used as the identity of a network. Which is often a problem of course in determining the Network ID. This problem often found when configuring Routing. Be it a static routing and dynamic routing on. Where the static routing commands and dynamic routing is required to mention the Network ID (Network Prefix).
This time I will review how to determine the Network ID, which is considered by most students this is a difficult thing. Though it is!
To determine the Network ID formula used is:
Network ID = IP Address Subnet Mask AND
example:
A network consisting of 4 pieces each PC with the address 192.168.3.2, 192.168.3.3, 192.168.3.4 and 192.168.3.5 and the subnet mask used is the default class C subnet mask is 255.255.255.0, then it is a Network ID,
AND 192.168.3.2 255.255.255.0
AND 192.168.3.3 255.255.255.0
AND 192.168.3.4 255.255.255.0
AND 192.168.3.5 255.255.255.0
The fourth address will result in the same network ID is 192.168.3.0, loh kok? How can? yes of course you can, because before the IP Address and Subnet mask in binary converted into 32 bits which are grouped by eight bits, separated by dots.
eg for 192.168.3.4 255.255.255.0 to AND,
11000000.10101000.00000011.00000100 AND 11111111.11111111.11111111.00000000 11000000.10101000.00000011.00000000 result if converted into a dotted decimal 192.168.3.0
How? make it easy? Ok, good luck
This time I will review how to determine the Network ID, which is considered by most students this is a difficult thing. Though it is!
To determine the Network ID formula used is:
Network ID = IP Address Subnet Mask AND
example:
A network consisting of 4 pieces each PC with the address 192.168.3.2, 192.168.3.3, 192.168.3.4 and 192.168.3.5 and the subnet mask used is the default class C subnet mask is 255.255.255.0, then it is a Network ID,
AND 192.168.3.2 255.255.255.0
AND 192.168.3.3 255.255.255.0
AND 192.168.3.4 255.255.255.0
AND 192.168.3.5 255.255.255.0
The fourth address will result in the same network ID is 192.168.3.0, loh kok? How can? yes of course you can, because before the IP Address and Subnet mask in binary converted into 32 bits which are grouped by eight bits, separated by dots.
eg for 192.168.3.4 255.255.255.0 to AND,
11000000.10101000.00000011.00000100 AND 11111111.11111111.11111111.00000000 11000000.10101000.00000011.00000000 result if converted into a dotted decimal 192.168.3.0
How? make it easy? Ok, good luck
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