Designing Physical Network Layout in Software

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Designing Physical Network Layout
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Each networking technology has its own physical restrictions and requirements within its own specifications There are, however, some generic guidelines that are useful when designing an internetwork that has to provide a high degree of availability Communication Vendor Issues The first thing to consider if you are going to install ISDN links as dial backups to the main communication lines is that the leased lines and ISDN lines likely will be provided by different vendors and delivered to a site by separate networks If the ISDN and main link are provided by one vendor service to one of your remote locations which, then experiences a lack of service due to problems at one of your communication vendor's central offices, going to dial backup is unlikely to help, as the ISDN connection most likely will be routed through the same central office that is experiencing problems There are additional issues to consider for a central site Typically at a central site that is housing
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broken, the vendor can always get traffic to you by using the other side This works only if the two fiber cables being used to deliver the service to your central site never use the same physical path This means there must be two points of access to your building so that the fibers can be diversely routed into your premises I have seen several organizations that had hoped to reap the reliability benefits of being on a SONET ring but were unable to do so because both fibers were pulled through the same access point to the building In this case, if one fiber gets broken, for example, if road workers break all cables going into one side of your building, both fibers will be broken, thus taking away part of the benefit of being on a SONET ring In metropolitan areas, many sites will be serviced with fiber links directly to the building In less densely populated areas, communication vendors typically have to extend service to a building using a direct copper link of some kind Typically it is not cost-justified for a communication vendor to extend a SONET ring to a remote area In the main, this is something you just have to live with The issue you face is that copper connections are more susceptible to interference than fiber cables, and you should expect more problems getting a copper-connected site operating at full throughput than you would with a fiber-connected site
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So far we have discussed issues related to internetwork design and configuration that have assumed all devices have an IP address configured Manually configuring IP addresses for each host router and PC implemented on a large internetwork can be a time-consuming task There are, however, some mechanisms such as RARP, BOOTP, and DHCP that can reduce this burden
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RARP: Reverse Address Resolution Protocol
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Reverse Address Resolution Protocol (RARP) converts MAC addresses into IP addresses, which is the reverse of what the regular ARP protocol does RARP originally was designed for supplying IP addresses to diskless workstations in an Ethernet environment A diskless workstation has no hard drive on which to locate its IP address; it does, however, have a unique MAC address on its network card When the diskless workstation boots up, it sends out a layer 2 broadcast (all 1s in the destination MAC address) When a server running RARP receives one of these broadcasts, it looks up a table (in a Unix machine, this table is usually located in the /etc/ethers file) and supplies the IP address that the table associates with the MAC address back to the machine originating the broadcast The functionality of RARP was enhanced by the bootstrap protocol BOOTP, and later the Dynamic Host Configuration Protocol DHCP is a superset of what BOOTP does BOOTP and DHCP are implemented with both client and server software, the former to request IP configuration information, and the latter to assign it Because DHCP was developed after BOOTP, DHCP servers will service IP configuration information to BOOTP clients
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