TCP/IP Analysis and Troubleshooting Toolkit by Kevin Burns

By Kevin Burns

  • A must-have consultant for troubleshooting and examining TCP/IP on the web and company network
  • Follows a realistic method of make sure that TCP/IP remains up and running
  • Describes difficulties in keeping with genuine situations within the box and offers confirmed recommendations to house them
  • Explains how one can use on hand instruments and utilities to their greatest advantage
  • Companion site comprises samples situations and code from the book

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TCP/IP Analysis and Troubleshooting Toolkit

A must have consultant for troubleshooting and reading TCP/IP on the net and company networkFollows a realistic method of make sure that TCP/IP remains up and runningDescribes difficulties in keeping with genuine eventualities within the box and offers confirmed options to accommodate themExplains the best way to use on hand instruments and utilities to their greatest advantageCompanion website contains samples eventualities and code from the e-book

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The first is a name resolution function that allows a host to determine the IP address of another host, given its name. The second, in this example, is the session layer setup performed by NetBIOS. It can only be performed once the IP address of the destination host is known. The degree that an application understands the heuristics of the transport layer determines its dependence on transport layer protocols. In pre-Windows 2000 environments, Microsoft’s Server Message Block (SMB) protocol needed session layer services of NetBIOS since it could not natively communicate with transport layer protocols like TCP.

It is also used by the NetBEUI protocol, which I will discuss in Chapter 3. Instead of an Ethertype, the LLC frame format uses a source service access point and a destination service access point, called SSAP and DSAP, respectively. The SSAP and DSAP values like Ethertypes tell the data link layer what upper-layer protocol should receive the data in the Layer 2 frame. Below is a decoding of an LLC frame. 3 frame has a 2-byte length field. We can see that the SSAP and DSAP values are 0xF0, which tells the data link layer that the upper-layer protocol is NetBIOS.

ARP is considered a helper protocol to TCP/IP and is discussed in Chapter 3. Summary As I dive into the specifics of these protocols, it is important to remember their foundation in the OSI model (or the DoD model if you so choose). The OSI model is our framework. It defines the purpose of the protocol. All functions of a protocol will reflect its main purpose inside of the layer. The best network analysts have the best understanding of the OSI model. That model must be given its due respect because it is relevant to every protocol procedure I discuss.

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