Inventory – Five Important CCNP Protocols 

Inventory – Five Important CCNP Protocols 

There are five important CCNP protocols. How many can you manage?


IS-IS (Intermediate System to Intermediate System Routing Protocol) is a routing protocol proposed by ISO. It is a link state protocol.

In this protocol, IS (router) is responsible for exchanging routing information based on link overhead and determining network topology. IS-IS is similar to the Open Shortest Path First (OSPF) Protocol of TCP / IP Network.

ISO Network includes Terminal System, Intermediate System, Area, and Domain. Terminal System refers to user’s equipment and the intermediate system refers to the router. The local group formed by the router is called a “region”, and multiple regions form a “domain”. IS-IS is designed to provide routing within a domain or within an area. IS-IS combines with CLNP, ES-IS and IDRP protocols to provide complete routing for the whole network.

IOS Definition

Cisco’s Internet Operating System (IOS) is a complex operating system optimized for Internet Interconnection – similar to a NetworkOperating System (NOS), such as Novell’s Netware, optimized for LANs. IOS provides unified rules for cost-effective maintenance of the Internet for a long time.

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In short, it is a software architecture separated from hardware. With the continuous development of network technology, it can be dynamically upgraded to adapt to changing technologies (hardware and software). IOS can be regarded as an Internet Interconnection hub: a highly intelligent administrator responsible for managing the functions of controlling complex distributed network resources.

IGP (Internal Gateway Protocol)

Internal Gateway Protocol (IGP) is a protocol dedicated to exchanging data flow channel information between gateways in an autonomous network system (such as an autonomous network system within a local community). Network IP protocol or other network protocols often determine how to transmit data flow through these channel information.

At present, the two most commonly-used Internal Gateway Protocols are Routing Information Protocol (RIP) and Shortest Path First Routing Protocol. At present, IGP includes RIP, OSPF, IGRP, EIGRP, IS-IS, and other protocols.


IPv6 is the abbreviation of Internet Protocol Version 6, in which internet protocol is translated as “Internet Protocol”.

IPv6 is the next-generation IP protocol designed by the IETF (Internet Engineering Task Force) to replace the current version of IP protocol (IPv4).

STP (Spanning Tree Protocol)

The protocol can be applied to the loop network to realize path redundancy through a certain algorithm. At the same time, the loop network is trimmed into a tree network without a loop, so as to avoid the proliferation and infinite circulation of messages in the loop network.

The basic principle of STP is to determine the network topology by passing a special protocol message between switches (this protocol message is called the “configuration message” in IEEE 802.1D). The configuration message contains enough information to ensure that the switch completes the spanning tree calculation.

The main application of Spanning Tree Protocol is to avoid network loopback in LAN and solve the problem of “broadcast storm” in a looped Ethernet network. In a sense, it is a network protection technology, which can eliminate the circular connection caused by mistakes or accidents.

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Inventory – Five Important CCNP Protocols