By Todd Lammle
Todd Lammle′s centred, concise overview advisor, up-to-date for the most recent CCNA tests CCNA is without doubt one of the so much wanted certifications for IT execs. If you′re getting ready for the CCNA Routing and Switching certification, this Sybex evaluate advisor bargains the easiest fast overview to be had. geared up by means of examination goal, it’s the suitable complement to different studying instruments, together with the Sybex CCNA Routing and Switching examine advisor (ISBN: 9781118749616).
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Additional info for CCNA Routing and Switching Review Guide Exams 100-101, 200-101, and 200-120
Sample text
Its job is to ensure data integrity at the Transport layer by allowing applications to request reliable data transport between systems. Flow control prevents a sending host on one side of the connection from overflowing the buffers in the receiving host. Reliable data 24 Chapter 1 Operation of IP Data Networks ■ transport employs a connection-oriented communications session between systems, and the protocols involved ensure that the following will be achieved: ■■ The segments delivered are acknowledged back to the sender upon their reception.
The top three layers (known as the upper layers) define how the applications within the end stations will communicate with each other as well as with users. The bottom four layers define how data is transmitted end to end. 15 shows the three upper layers and their functions. 15, understand that users interact with the computer at the Application layer and also that the upper layers are responsible for applications communicating between hosts. None of the upper layers knows anything about networking or network addresses because that’s the responsibility of the four bottom layers.
Com/blog. So basically, each URL defines the protocol used to transfer data, the name of the server, and the particular web page on that server. Hypertext Transfer Protocol Secure (HTTPS) Hypertext Transfer Protocol Secure (HTTPS) is also known as Secure Hypertext Transfer Protocol. It uses Secure Sockets Layer (SSL) or Transport Layer Security (TLS). Sometimes you’ll see it referred to as SHTTP or S-HTTP, which were slightly different protocols, but 14 Chapter 1 Operation of IP Data Networks ■ since Microsoft supported HTTPS, it became the de facto standard for securing web communication.