CCNA Exploration Course Booklet: LAN Switching and Wireless, by Cisco Networking Academy

By Cisco Networking Academy

The Cisco CCNA Exploration curriculum offers a entire review of networking, from basics to complicated purposes and providers. This path emphasizes theoretical ideas and useful program, supplying you with hands-on abilities for designing, fitting, working, and holding real-world networks. whereas wide on-line research assets and entire textbooks can be found, many scholars and teachers have asked a inexpensive published source that may be used to review in locations the place web entry is probably not on hand. This e-book is that source. Drawn at once from the web curriculum, it covers each ability and competency coated within the latest CCNA Exploration LAN Switching and instant path. This publication lets you research offline, spotlight key issues, and take handwritten notes. All subject matters are correlated on to on-line web content, supporting you simply swap among offline and on-line content material.


  • Gives CCNA Exploration scholars a cheap learn source that may be learn anywhere net entry isn't really to be had
  • Handy published structure enables you to simply spotlight and make notes
  • Page correlations hyperlink on to the web curriculum
  • Covers the most recent model of the CCNA Exploration LAN Switching and instant cours

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Additional resources for CCNA Exploration Course Booklet: LAN Switching and Wireless, Version 4.0:

Sample text

This is shown in the first half of the animation. When a switch receives a broadcast frame, it forwards the frame to each of its ports, except the incoming port where the switch received the broadcast frame. Each attached device recognizes the broadcast frame and processes it. This leads to reduced network efficiency, because bandwidth is used to propagate the broadcast traffic. When two switches are connected, the broadcast domain is increased. In this example, a broadcast frame is forwarded to all connected ports on switch S1.

Recall that a Layer 2 switch builds a MAC address table that it uses to make forwarding decisions. A Layer 3 switch, such as the Catalyst 3560, functions similarly to a Layer 2 switch, such as the Catalyst 2960, but instead of using only the Layer 2 MAC address information for forwarding decisions, a Layer 3 switch can also use IP address information. Instead of only learning which MAC addresses are associated with each of its ports, a Layer 3 switch can also learn which IP addresses are associated with its interfaces.

This allows the packet to be received on one port and then transmitted on another port, without moving it to a different queue. The switch keeps a map of frame to port links showing where a packet needs to be transmitted. The map link is cleared after the frame has been successfully transmitted. The number of frames stored in the buffer is restricted by the size of the entire memory buffer and not limited to a single port buffer. This permits larger frames to be transmitted with fewer dropped frames.

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