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It is possible for a datagram to generate ICMP errors after it has been fragmented. For example, suppose that each of two fragments cannot be delivered. Seemingly, this would mean that one transmitted datagram would cause two ICMP errors to be sent back to the transmitter. However,the textbook on page 517 indicates that the ICMP error should be sent for only the ?rst fragment that causes the error. This is a convenient simpli?cation: it means that your transmiting APP need never listen for more than one ICMP error response.
RFC 791 de?nes IP and RFC 792 de?nes ICMP. Both date to September 1981. ICMP, although typically mentioned as a separate protocol-and sometimes not mentioned at all-is a required part of IP; i.e., an implementation of IP is non- conforming unless it includes ICMP. RFC 1122 (October 1989) updates and clari?es the earlier standards, based on experience gained in the 80s. RFC 1122 is quite long and detailed. Since RFC 1122, the only revisions to IPv4 have addressed type-of-service.
Explain the Physical layer The Physical layer of the OSI model sets standards for sending and receiving electrical signals among devices. It explains how digital data (bits) ar
What is a jam signal A jam signal is broadcasts to network by the transmitting stations that detected the collision to ensure that all stations know of the collision. Every st
Ajax is a relatively new set of techniques that, in a sense, implement some of the functionalities originally provided by RPC. Ajax is primarily used to build web applications with
Q. How is computer networks used in Financial services? Financial services: Today's financial services are totally depended on networks. Application includes credit history
Burn in Address other name is MAC address
What are the Advantages of the intranet The most easily noticeable difference between an Internet server and an Intranet server such as Lotus Notes is their design philosophy.
Verify Passwords Step 1 : Telnet to the router from Host2 and verify the Telnet password. You should be able to telnet to either Fast Ethernet interface of the router. I
Router#setup is the command to run 'setup'
Compute the shortest path from t to all network nodes.
Root DNS Servers A root server is a serve which consists of the entire hierarchy of servers. A root server usually does not store any information about domains but
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