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You now know that a network uses a network topology which is the layout of the network and you know that some form of media such as cabling connects all hosts on the network We have discussed the three major types of cabling: coax, twistedpair, and fiber-optic cabling This section will identify what are known as access methods An access method determines how a host will place data on the wire does the host have to wait its turn or can it just place the data on the wire whenever it wants The answer is determined by three major access methods: CSMA/CD, CSMA/CA, and token passing Let s look at each of these access methods

Carrier sense multiple access with collision detection (CSMA/CD) is one of the most popular access methods in use today With CSMA/CD, every host has equal access to the wire and can place data on the wire when the wire is free from traffic If a host wishes to place data on the wire, it will sense the wire and determine whether there is a signal already on the wire If there is, the host will wait to transmit the data; if the wire is free, the host will send the data, as shown in Figure 1-29

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CBAC only inspects TCP and UDP packets Other IP traffic (such as ICMP) should be filtered with traditional IP access lists Packets with the router as the source or destination address are not inspected by CBAC If both encryption and CBAC are configured, CBAC will not have the capacity to accurately inspect the contents of the encrypted packets In this scenario, the only multi-channel protocols that CBAC will be able to inspect are StreamWorks and CU-SeeMe CBAC should be configured to inspect only these applications and generic TCP and UDP sessions CBAC uses approximately 600 bytes of memory per connection to maintain the state table Additionally, a small amount of additional processing occurs during the inspection process

1:

figure 1-29

We need to achieve a tunnel between router 1 and router 2 that will transport any NetBEUI packet between LAN 1 and LAN 2 The configuration for router 1 and router 2 to achieve this is given in Fig 5-24, which we will discuss line by line The following commands configure router 1 for passing NetBIOS packets via DLSw over a TCP connection Command dlsw local-peer peer-id 162851 enables DLSw on the router and identifies the interface with IP address 162851 (in this case the Ethernet 0 interface) as the one being presented with NetBIOS packets Command dlsw remote-peer tcp 162861 identifies the IP address of the remote device with which to exchange traffic using TCP In this case, it is the Ethernet interface of router 2 In essence, the local peer and remote peer identify the two ends that will use TCP to carry NetBIOS packets between them Command dlsw bridge-group 1 is used to enable DLSw+ on the Ethernet interfaces that are assigned membership of bridge group 1 in interface configurations In effect, DLSw+ is attached to a transparent bridge group, meaning the NetBIOS packets are exchanged transparently between all members of the bridge group Commands interface ethernet 0 through bridge-group 1 identify this Ethernet interface as participating in the transparent bridge group 1 The commands for router 2 are basically a mirror image of the commands entered for router 1, and you can see that the local peer for one router becomes the remote peer for its companion router, and vice versa This method of providing NetBIOS connectivity over a TCP connection works, but does not give you much control over which NetBIOS packets get forwarded and which do not If there are multiple NT servers at each location, all the NetBIOS packets they generate will be forwarded over the link whether you want them to be or not A slightly better option is to use the facilities within Microsoft's software to encapsulate NetBEUI traffic within TCP/IP directly within the NT server itself Using WINS to Announce Services Over an IP WAN At the most basic level, a NetBIOS-based application needs to see computer names, while IP devices need to work with IP numbers If the communication medium between two machines trying to communicate with each other via a NetBIOS- based packet is an IP network, there must be a mechanism for mapping NetBIOS names to IP addresses and converting the IP addresses back to NetBIOS names This mechanism is the NetBIOS over TCP/IP protocol, otherwise known as NBT.

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