Which component of the IP header may be modified to make certain that a data packet will go through no more than N routers on its way to the location specified in the header?
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Which component of the IP header may be modified to make certain that a data packet will go through no more than N routers on its way to the location specified in the header?
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- What information in the IP header should be supplied to ensure that a packet is sent? Is it limited to N routers?In a TCP data packet, if the sequence number has the value 001111, ACK number has the value 010110 and the urgent pointer has the value 001100 assuming that URG flag is set. What is the last urgent byte in the data section of the packet? All numbers are in binary.What is the required parameter to use while redistributing a route into EIGRP? A number of different elements, such as the exit interface and the IP address of the following hop, might have an effect on administrative distance.
- SMTP (Simple Mail Transfer Protocol) is the standard protocol for transferring mail between hosts. A TCP connection is set up between a user agent and a server program. The server listens on TCP port 25 for incoming connection requests. The user end of the connection is on a TCP port number above 1023. You have defined the packet filter rule set shown in the table below. These rules permit and/or deny inbound and outbound traffic between the user agent and the mail server. Describe the purpose of each packet filter rule in the table. Rule Direction Source Address Destination Address Protocol Destination Port Action A2 In External Internal TCP 25 Permit B2 Out Internal External TCP > 1023 Permit C2 Out Internal External TCP 25 Permit D2 In External Internal TCP > 1023 Permit E2 Either Any Any Any Any DenySuppose the sequence number field on a TCP packet is 46005. The packet carries 102 bytes of (application-layer) data. The TCP header size on this packet is 20 bytes. (a) What is the sequence number of the last application byte contained in the packet above? (b) What is the value of the acknowledgment number field on the ACK that the receiver generates for the packet above? (c) Do you have sufficient information in this question to determine the value of the sequence number field of the ACK packet that the receiver generates for the packet above? If so, what is the sequence number? If not, why not? (d) If the size of the TCP header were larger (e.g., 24 bytes, due to additional TCP options), would your answers to parts (a)–(c) change? Why or why not?IP datagrams on a specific network can carry a maximum of only 440 bytes in the data portion. A node on this network, running an application using TCP generates a TCP segment with 1,900 bytes in the data portion. How many IP packets are transmitted to carry this TCP segment, and what are their sizes (including the header of 20 bytes)?
- What is the maximum number of routers that can be registered if the timestamp option flag in an IP datagram is set to the value of 1?Host A and B are communicating over a TCP connection, and Host B has already received all bytes up through byte 100 (including Byte 100) from A. Suppose Host A then sends two packets to Host B back-to-back. The first and second packets contain 40 and 80 bytes of data, respectively. Host B sends an acknowledgment whenever it receives a packet from Host A. a. What is the sequence number of the first packet sent from Host A to Host B? What is the sequence number of the second packet sent from Host A to Host B? b. If the second packet arrives before the first packet, in the acknowledgment of the first arriving packet, what is the acknowledgment number? .7.Now I am sending the 3rd packets in a TCP link. Before this packets there are totally 200 bytes sent. Assume every packet is in equal size. What is the sequence number of this 3rd packet and what is the ACK number for this packet? 请输入答案
- What field should be included in the IP header to guarantee that a packet is sent only to N routers?Suppose an Ethernet packet represents a TCP acknowledgment; that is, the packet contains an IPv4 header with no options and a 20-byte TCP header but nothing else. Is the IPv4 packet here smaller than the Ethernet minimum packet size, and, if so, by how much? What if the packet is IPv6 with no extension headers?Which of the following statements could be valid with respect to the ICMP (Internet Control Message Protocol)? a. It reports all errors which occur during transmission. b. A redirect message is used when a router notices that a packet seems to have been routed wrongly. c. It informs routers when an incorrect path has been taken. d. The "destination unreachable" type message is used when a router cannot locate the destination.
