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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.
Q. Describe Flow and Error Control Mechanisms? Flow and Error Control Mechanisms - Stop and Wait ARQ - Go-Back ARQ - Selective Repeat ARQ
There are two logical addressing :- a) Datalink is physical (hardware) addressing. b) Network is logical (software) addressing.
Q. Define Name Space in domain name system? - All names assigned to machines on an internet - Must be unique; either flat or hierarchical - Flat name space - name is assi
NICs AND NETWORK HARDWARE: NIC is create for one kind of physical network. For example Ethernet interface may not be needed with token ring and similar ATM interface cannot b
Configure the management interface address on all three switches. S1(config)#interface vlan1 S1(config-if)#ip address 172.17.10.1 255.255.255.0 S1(config-if)#no shutdown
REPEATERS: Repeaters are needed when copper wire communication is takes place. According to the fact that electrical signal goes weaker while travelling over copper lines. A
Question Which elementary logic gate is equivalent to this circuit? Show your working.
Distance covered, Based on size, ownership and physical architecture - LAN (Local Area Network) - Suitable for smaller geographical area - MAN (Metropolitan Area Network) - S
What metrics are used by routing protocols to verify the best path?
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