By Alex Zinin
During this publication, a number one professional on Cisco routing deals in-depth assurance of 4 key intra-domain protocols -- RIP, IGRP, OSPF, and EIGRP. in contrast to different books on Cisco protocols, Alex Zinin indicates you precisely what is occurring inside of your routers if you happen to use those protocols -- so that you can maximize your keep watch over over them, and leverage their complete energy. Cisco IP Routing demystifies even the main complicated internals of Cisco IP routing with transparent motives, huge visuals, and lots of real-world examples, configurations, and community designs. the center of the booklet is its insurance of dynamic routing, beginning with concept after which relocating to the sensible info of potent configuration. Alex Zinin additionally offers in-depth insurance of controlling routing through changing replace movement, redistribution, and coverage routing. For all community directors, different Cisco networking pros, and a person getting ready for Cisco's probably the greatest CCIE examination.
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Extra resources for Cisco IP Routing: Packet Forwarding and Intra-domain Routing Protocols
To give you a better understanding, we consider the two basic parts of classless IP classless addressing and classless routing separately. The main, and most obvious, problem with classful addressing is that the standard subnetting procedure is not really flexible, as it requires a single subnet mask to be used throughout the entire major network, regardless of how many hosts are actually on each segment. Imagine using four bits for subnetting and four bits for host numbering. Four bits can be used to address 14 hosts on one segment, which is okay for LANs but not for point-to-point links, where there are only two hosts.
Interface: the network attachment description. Various characteristics are associated with each interface, including the following, which are considered interesting from the forwarding perspective: ♦ Type Can be point-to-point, point-to-multipoint, or broadcast, depending on the type of encapsulation. 25 interfaces are point-to-multipoint; Ethernet and Token Ring interfaces are broadcast. ♦ State Operational status up or down of the interface. The state of the interface is determined by the status of the physical and the data link layer protocols.
It was mentioned when considering subnetting examples, that border values of all 0s and all 1s are not used for subnet and host numbers. The reason for that is addressing conventions: • All 0s in all bits. 0 is an obsolete form of local broadcast. • All 0s in the network part. This case is described in [RFC791]. An address with all 0s in the network part may be used to specify this network, the network a host is currently on. This type of addressing is usually used in some Internet Control Message Protocol (ICMP) and BOOTP messages.