Ethernet cabling

Ethernet cabling

Ethernet was first implemented by a group called DIX, which stands for digital, Intel, and Xerox. They created and implemented the first Ethernet LAN specification, which the IEEE used to create the IEEE 802.3 committee. This was a 10 Mbps network that ran on coax and then eventually twisted-pair and fiber physical media.

Three types of Ethernet cables are available:

1. Straight-through cable

2. Crossover cable

3. Rolled over cable

Straight-through cable

The straight-through cable is used to connect the Host to the switch or hub, and the router to the switch or hub. Four wires are used in straight-through cables to connect Ethernet devices. It is relatively simple to create this type, the four wires used in a straight-through Ethernet cable.

Only pins 1, 2, 3, and 6 are used. Just connects 1 to 1, 2 to 2, 3 to 3, and 6 to 6. Remember that this would be an Ethernet-only cable and wouldn’t work with Voice, Token ring, ISDN, and so on.

Crossover cable

The crossover cable can be used to connect switch to switch, hub to hub, host to host, and hub to switch router direct to host. The same four wires are used in this cable as in the straight-through cable; we just connect different pins together.

Instead of connecting 1 to 1, 2 to 2, and so on, here we connect pins 1 to 3 and 2 to 6 on each side of the cable.

Rolled over cable

Although rolled cable isn’t used to connect any Ethernet connections together, you can use a rolled Ethernet cable to connect a host to a router console serial communication (com) port.

If you have a Cisco router or switch, you would use this cable to connect your PC running hyper-terminal to the Cisco hardware. Eight wires are used in this cable to connect serial devices, although not all eight are used to end information, just as in Ethernet networking.

Comments

What is Classification and marking? What is IP Precedence and DSCP Values? What is AF and EF?

Classification and Marking Classification and marking are the processes of identifying the priority of each packet. This is the first step of QOS control and should be done near the source hosts. Classification is the process of identifying and categorising traffic into classes, typically based upon incoming interface IP precedence, DSCP Source or Destination address. Application classification is the most fundamental QOS building block. Without classification, all packets are treated the same. The table lists the criteria of classification Marking Marking is the QOS feature component that colours a packet so it can be identified and distinguished from other packets in QOS treatment. Commonly used markers: link-layer: COS (ISL, 802.1q), MPLS EXP bits,...

OSPF default routing

OSPF Default Route Configuring OSPF Default route is not a big problem. We have couple of options when we want to OSPF default route. Here is an example R1(config)#router ospf 1 R1(config-router)#default-information originate ? always Always advertise default route metric OSPF default metric metric-type OSPF metric type for default routes route-map Route-map reference <cr> We can change numbers of things for example metric or metric type but most of the people forget about the most important thing is the always keyword. If we add the always command this feature advertises the default route even if we do not have in our routing table. It will look like that route is installed in routing table. When we use the default information originate we can advertise a default route in OSPF. But OSPF won’t...

BGP Local preference configuration

BGP Local preference (Local_Pref) Path attribute gives the router inside a single autonomous system a value that they can set per-route and advertise to all iBGP routers inside the autonomous system, so that all routers in the autonomous system agree about which routers is the best exit point for packet destined for that prefix. Local preference (Local_Pref) is the second BGP attribute. We can use the local preference to choose the outbound external BGP path. Local preference is sent to all internal BGP (iBGP) routers in our autonomous system. Local preference (Local_Pref) is not exchanged between external BGP routers. It’s a well-known and discretionary BGP attribute. Default value is 100. The path with the highest local preference is desirable Topology:- TASK: To reach 50.1.1.1, 15.0.0.1 network router 2 and router 3 using 3.1.1.2 path ( AS 65144) because it has less numbers of au...

edgarnetwork

Search This Blog