Connecting a server directly to fasteth port

phoeneous

I never knew you could connect a server directly to the fast ethernet ports of a router. I always thought you needed a switch. I labbed it up in Packet Tracer and it indeed works. How is this possible without a L2 device? What processes the frames?

tiersten

Crossover cable.

kryolla

A router is unaware that a switch is attached to it. A switch doesn't do any munipulation to the frame all it does is read the frame and send it out the appropiate port. HTH

networker050184

What did you think the switch was doing to the frames?

Kaminsky

phoeneous wrote: »

I never knew you could connect a server directly to the fast ethernet ports of a router. I always thought you needed a switch. ...

How is this possible without a L2 device? What processes the frames?

What do you mean by "layer 2 device" ?
I am really hoping your on the bear, otherwise, you need to give the CCENT back. Ethernet man.... Ethernet ! OSI model and all that hokum !

kryolla

networker050184 wrote: »

What did you think the switch was doing to the frames?

setting the ID ten tango bit so the router will accept it.

phoeneous

kryolla wrote: »

setting the ID ten tango bit so the router will accept it.

Yeah, thats real professional...

Ive always respected this forum up until now.

tech-airman

phoeneus,

phoeneous wrote: »

I never knew you could connect a server directly to the fast ethernet ports of a router. I always thought you needed a switch. I labbed it up in Packet Tracer and it indeed works. How is this possible without a L2 device?

Your "L2 device" in your network are:

1. The NIC in the server
2. The Fast Ethernet interface in the router

phoeneous wrote: »

What processes the frames?

The frames are being processed by the Data-Link Layers within:

1. The NIC in the server
2. The Fast Ethernet interface in the router

Recall from your 640-822 ICND1 certification exam studies the encapsulation and decapsulation processes. The encapsulation process as you might have learned is as follows...

Encapsulation process

[ Server             ]
[[Application Layer] ]
[ |                  ]
[ v                  ]
[[Presentation Layer]]
[ |                  ]
[ v                  ]
[[Session Layer]     ]
[ |                  ]
[ v                  ]
[[Transport Layer]   ]
[ |                  ]
[ v                  ]
[[Network Layer]     ]
[ |                  ]
[ v                  ]
[[Data Link Layer]   ]
[ |                  ]
[ v                  ]
[[Physical Layer]    ]-----------{Crossover UTP cable}------

Note, the entire encapsulation process occurs within the server box. The server communicates outwards through the network cable.

Now, let's look at the decapsulation process within the router....

Decapsulation process

                                 [ Router          ]
                                 [[Network Layer]  ]
                                 [ ^               ]
                                 [ |               ]
                                 [[Data Link Layer]]
                                 [ ^               ]
                                 [ |               ]
------{Crossover UTP cable}------[[Physical Layer] ]

Similar to the server above, the entire decapsulation process occurs within the router. The reason why a router is considered a "layer 3 device" is that is the highest level of decapsulation and encapsulation (when the packet is routed and sent out of the exit interface) processes. The router is being communicated to through the crossover UTP cable.

Now do you see why I say that the "frames are being processed within each device (server or router)?"

networker050184

phoeneous wrote: »

Yeah, thats real professional...

Ive always respected this forum up until now.

Whats wrong with a little humor?