Network Warrior

Network Warrior

Gary A. Donahue

Language: English

Pages: 788

ISBN: 1449387861

Format: PDF / Kindle (mobi) / ePub


Pick up where certification exams leave off. With this practical, in-depth guide to the entire network infrastructure, you’ll learn how to deal with real Cisco networks, rather than the hypothetical situations presented on exams like the CCNA. Network Warrior takes you step by step through the world of routers, switches, firewalls, and other technologies based on the author's extensive field experience. You'll find new content for MPLS, IPv6, VoIP, and wireless in this completely revised second edition, along with examples of Cisco Nexus 5000 and 7000 switches throughout.

Topics include:

  • An in-depth view of routers and routing
  • Switching, using Cisco Catalyst and Nexus switches as examples
  • SOHO VoIP and SOHO wireless access point design and configuration
  • Introduction to IPv6 with configuration examples
  • Telecom technologies in the data-networking world, including T1, DS3, frame relay, and MPLS
  • Security, firewall theory, and configuration, as well as ACL and authentication
  • Quality of Service (QoS), with an emphasis on low-latency queuing (LLQ)
  • IP address allocation, Network Time Protocol (NTP), and device failures

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moves air vertically and the modules sit vertically in the chassis. With this switch, you can see the air vents plainly on the front of the chassis. Take care to keep them clear. All Nexus switches are designed for front-to-back airflow to facilitate hot-/cold-aisle data-center designs. Be careful when mounting these switches. Some people like to have the Ethernet ports in the front of the rack. With Nexus, this position is a bad idea, as air will flow in the wrong direction in the rack. I once

1,000 Mbps. 1,000 Mbps Ethernet is also referred to as Gigabit Ethernet. Many switches now support 10 Gbps Ethernet, and 100 Gbps is on the horizon as well. Duplex Duplex refers to how data flows on the interface. On a half duplex interface, data can only be transmitted or received at any given time. A conversation on a twoway radio is usually half-duplex—each person must push a button to talk and, while talking, that person cannot listen. A full-duplex interface, on the other hand, can send and

to be connected to a port configured with PortFast active, a loop could occur that would not be detected. To enable PortFast on an IOS switch, use the spanning-tree portfast interface command. The switch will deliver a nice warning about the dangers of PortFast when you enable the feature: Cat-3550(config-if)#spanning-tree portfast %Warning: portfast should only be enabled on ports connected to a single host. Connecting hubs, concentrators, switches, bridges, etc... to this interface when

last line shows the administrator tag as 3, indicating that routes redistributed into EIGRP (specifically, redistributed connected routes) have been marked with a tag of 3. EIGRP doesn’t do anything with this information other than store it. So what does tagging do for you? Just as you can set a tag to apply when redistributing routes into a routing protocol, you can also test for a tag, and permit or deny redistributions based on it. Call me a nerd, but I think that’s pretty cool. To check for

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

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