CCNA Routing and Switching Review Guide Exams 100-101, by Todd Lammle

By Todd Lammle

Todd Lammle′s centred, concise overview consultant, up-to-date for the most recent CCNA tests CCNA is without doubt one of the so much wanted certifications for IT pros. If you′re getting ready for the CCNA Routing and Switching certification, this Sybex evaluation advisor deals the simplest speedy overview on hand. equipped by way of examination aim, it’s the precise complement to different studying instruments, together with the Sybex CCNA Routing and Switching learn consultant (ISBN: 9781118749616).

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Additional resources for CCNA Routing and Switching Review Guide Exams 100-101, 200-101, and 200-120

Sample text

Telnet achieves this by pulling a fast one on the Telnet server and making the client machine appear as though it were a terminal directly attached to the local network. This projection is actually a software image—a virtual terminal that can interact with the chosen remote host. A drawback is that there are no encryption techniques available within the Telnet protocol, so everything must be sent in clear text, including passwords! 6 shows an example of a Telnet client trying to connect to a Telnet server.

In this simplified example, both the sending and receiving machines are workstations. Remember that in reality, the transmission isn’t based on simple numbers but in the amount of bytes that can be sent! F ig u r e 1 . 2 0 Windowing Sender Send 1 Receiver Window size of 1 Receive 1 ACK 1 Send 1 Receive 2 ACK 2 Send 1 Window size of 3 Send 2 Send 3 ACK 4 Send 4 Acknowledgments Reliable data delivery ensures the integrity of a stream of data sent from one machine to the other through a fully functional data link.

27 which are layer 3 devices, are specified at this layer and provide the routing services within an internetwork. Here’s how that works: First, when a packet is received on a router interface, the destination IP address is checked. If the packet isn’t destined for that particular router, it will look up the destination network address in the routing table. Once the router chooses an exit interface, the packet will be sent to that interface to be framed and sent out on the local network. If the router can’t find an entry for the packet’s destination network in the routing table, the router drops the packet.

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