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Chapter 2 - TCP/IP Communications

Cisco TCP/IP Routing Professional Reference
Chris Lewis
  Copyright © 1999 The McGraw-Hill Companies, Inc.

Summary
In this chapter we defined what a protocol is and explored two models for data communications, the OSI and TCP/IP (DoD) model. Specific protocols within the TCP/IP protocol stack were identified and the relevant addressing schemes used by each were explained. The discussion on addressing also introduced the concept of the subnet mask and how that can be used to divide a network into many subnetworks. Finally, we saw an overview of how TCP/IP protocols and reference tables cooperate to deliver a packet across an internetwork.
Answers to Netmask Questions
IP address
= 164.2.34.35
netmask
= 255.255.255.224
subnet address
= 162.2.34.32
usable host addresses
= 162.2.34.33 to 62
broadcast address
= 162.2.34.63
IP address
= 101.2.3.18
netmask
= 255.255.0.0
subnet address
= 101.2.0.0
usable host addresses
= 101.2.0.1 to 101.2.255.254
broadcast address
= 101.2..255.255

 


 
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