New PDF release: CCNA Routing and Switching Review Guide Exams 100-101,

By Todd Lammle

Todd Lammle′s targeted, concise assessment consultant, up-to-date for the newest CCNA assessments CCNA is without doubt one of the such a lot wanted certifications for IT pros. If you′re getting ready for the CCNA Routing and Switching certification, this Sybex overview consultant bargains the simplest fast assessment on hand. equipped via examination goal, it’s the correct complement to different studying instruments, together with the Sybex CCNA Routing and Switching examine advisor (ISBN: 9781118749616).

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

Example text

24 shows the Data Link layer with the Ethernet and IEEE specifications. 2 standard is used in conjunction with and adds functionality to the other IEEE standards. It’s important for you to understand that routers, which work at the Network layer, don’t care at all about where a particular host is located. They’re only concerned about where networks are located and the best way to reach them—including remote ones. Routers are totally obsessive when it comes to networks, which in this case is a good thing!

14 shows the process of a client-server relationship using a DHCP connection. This is the four-step process a client takes to receive an IP address from a DHCP server: 1. The DHCP client broadcasts a DHCP Discover message looking for a DHCP server (UDP port 67). 2. The DHCP server that received the DHCP Discover message sends a layer 2 unicast DHCP Offer (UDP port 68) message back to the host. 3. The client then broadcasts to the server a DHCP Request message asking for the offered IP address and possibly other information.

What files do you have? I’m TFTP! I don’t know! Fine! Give me a specific file from flash memory. Here is the name of the file... I can do that! This compact little protocol also skimps in the data department, sending much smaller blocks of data than FTP. Also, there’s no authentication as with FTP, so it’s even more insecure, and few sites support it because of the inherent security risks. 10. It gathers data by polling the devices on the network from a network management station (NMS) at fixed or random intervals, requiring them to disclose certain information, or even by asking for certain information from the device.

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