Network Warrior (2nd Edition) by Gary A. Donahue
By Gary A. Donahue
Pick up the place certification assessments depart off. With this useful, in-depth advisor to the complete community infrastructure, you’ll how one can take care of actual Cisco networks, instead of the hypothetical occasions awarded on tests just like the CCNA. Network Warrior takes you step-by-step during the global of routers, switches, firewalls, and different applied sciences according to the author's vast box event. You'll locate new content material for MPLS, IPv6, VoIP, and instant during this thoroughly revised moment version, besides examples of Cisco Nexus 5000 and 7000 switches throughout.
* An in-depth view of routers and routing
* Switching, utilizing Cisco Catalyst and Nexus switches as examples
* SOHO VoIP and SOHO instant entry element layout and configuration
* advent to IPv6 with configuration examples
* Telecom applied sciences within the data-networking global, together with T1, DS3, body relay, and MPLS
* safety, firewall idea, and configuration, in addition to ACL and authentication
* caliber of carrier (QoS), with an emphasis on low-latency queuing (LLQ)
* IP deal with allocation, community Time Protocol (NTP), and gadget disasters
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Extra info for Network Warrior (2nd Edition)
A broadcast domain is the area of an Ethernet network where a broadcast will be propagated. Broadcasts stay within a Layer-3 network (unless forwarded), which is usually bordered by a Layer-3 device such as a router. Broadcasts are sent through switches (Layer-2 devices) but stop at routers. Many people mistakenly think that broadcasts are contained within switches or virtual LANs (VLANs). I think this is because they are so contained in a properly designed network. If you connect two switches with a crossover cable—one configured with VLAN 10 on all ports and the other configured with VLAN 20 on all ports—hosts plugged into each switch will be able to communicate if they are on the same IP network.
Broadcasts and IP networks are not limited to VLANs, though it is very tempting to think so. Figure 2-5 shows a network of hubs connected via a central hub. When a frame enters the hub on the bottom left on Port 1, the frame is repeated out every other port on that hub, which includes a connection to the central hub. The central hub in turn repeats the frame out every port, propagating it to the remaining hubs in the network. This design replicates the backbone idea, in that every device on the network will receive every frame sent on the network.
Many companies attached hubs to their existing thin-net networks to allow greater flexibility as well. Hubs were made to support UTP and BNC 10Base-2 installations, but UTP was so much easier to work with that it became the de facto standard. A hub is simply a means of connecting Ethernet cables together so that their signals can be repeated to every other connected cable on the hub. Hubs may also be called repeaters for this reason, but it is important to understand that while a hub is a repeater, a repeater is not necessarily a hub.