4)In the following IPsec ESP Tunnel model, Which parts are authenticated? a ESP Header , IP Header , TCP header , Data , ESP Tailer are Authenticated b New IP HEeader , ESP Header , IP Header , TCP header , Data , ESP Tailer are Autheniticated c New IP HEeader , ESP Header , IP Header , TCP header , Data , ESP Tailer, ESP AUTH are Autheniticated d ESP Header , IP Header , TCP header , Data , ESP Tailer , ESP AUTH are Autheniticated

4)In the following IPsec ESP Tunnel model, Which parts are authenticated? a ESP Header , IP Header , TCP header , Data , ESP Tailer are Authenticated b New IP HEeader , ESP Header , IP Header , TCP header , Data , ESP Tailer are Autheniticated c New IP HEeader , ESP Header , IP Header , TCP header , Data , ESP Tailer, ESP AUTH are Autheniticated d ESP Header , IP Header , TCP header , Data , ESP Tailer , ESP AUTH are Autheniticated

A+ Guide To It Technical Support

10th Edition

ISBN:9780357108291

Author:ANDREWS, Jean.

Publisher:ANDREWS, Jean.

Chapter8: Network Infrastructure And Troubleshooting

Section: Chapter Questions

Problem 8TC

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Q' Figure below shows the IPV4 datagram format. Fill the fields from 1 to 5 by choosing the right answers 2 16-bit identifier ID flags 3 4 32 bit source IP address 5 options Data (variable length, typically a TCP or UDP segment) 1- Field (1) is for: a- Time to live b- IP protocol version number c- Type of service d- Header checksum e- Upper layer protocol f- None of them 2- Field (2) is for: a- Time to live b- IP protocol version number c- Type of service d- Header checksum e- Upper layer protocol f- None of above 3- Field (3) is for: a- Time to live b- IP protocol version number c- Type of service d- Header checksum e- 32 bit destination IP address f- None of them
Consider the datagrams of each layer in the TCP/IP model, e.g., Frame at the Link Layer, Packet at the Internet Layer. Explain the functioning of the following protocols based on their datagram header fields only. Note: You do not need to describe the header field but based on the header field, explain how the protocol works, e.g., Acknowledgement field in a TCP Header is responsible for providing reliable data transfer and in case of data loss or ACK not received, segment is re-sent. You do not need to consider every field of the headers but wherever there are more than 4 fields, then based on 5 fields, describe its functioning, if less than or equal to 4 fields then consider all the fields. Ethernet Frame 11 Frame IPv4 Packet IPv6 Packet TCP Segment UDP Segment HTTP
The IPV4 Header Header And Its Fields Are Given For Your Reference. Read the questions that follow the Header diagram. IPV4 Header Byte Offset IHL (Header Length) Version Type of Service (TOS) Total Length IP Flags x D M 4 Identification Fragment Offset 20 Time To Live (TTL) Protocol Header Checksum Bytes II I I I IHL (Internet Header Length) 12 Source Address 16 Destination Address 20 IP Option (variable length, optional, not common) Bit To 1 2 3 4 5 6 78 9 0 1 2 3 4 56 7 89 Nibble FByte Word 2 314 5 6 7 8 9 0 Version IP Flags Protocol Fragment Offset Version of IP Protocol. 4 and 6 are valid. This diagram represents version 4 structure only. IP Protocol ID. Including (but not limited to): 1 ICMP 17 UDP 2 IGMP 47 GRE 88 EIGRP 6 TCP 9 IGRP 51 AH Fragment offset from start of IP datagram. Measured in 8 byte (2 words, 64 bits) increments. If IP datagram is fragmented, fragment size (Total Length) must be a multiple of 8 bytes. x DM 57 SKIP x Ox80 reserved (evil bit) D Ox40 Do Not…
Q2.Part A: Suppose COMPUTER-A send a message “I will work hard in Finals” on internet to COMPUTER-B. How that communication takes place according to OSI 7 layers model? Write very short description of each of 7 layers DIAGRAM for your answers on both computers. Part B: Mentioned differences and similarities between term “TCP/IP” and “OSI Model” in your own words?
Create a chart that begins with the OSI Seven-layer model on the left-hand side. Next, a column that describes the function of the layer. Then a column that lists the Protocol Data Units (such as Datagrams, Frames, etc) that correspond to each layer in the OSI model. Continue this process for the major hardware or software applications that function in each layer (not all layers have corresponding applications). The last column should be the TCP/IP model aligned to the appropriate layers of the OSI seven-layer model. This should result in a document that looks something like the chart tab (with the blank spaces filled in!)
Provide short answers to the following: How do you determine whether an IP address is a multicast address? What is the TTL field in the IP header used for? What is the maximum length of options bytes that can be carried in an IPv4 header? Why do we have to multiply the offset field of an IP datagram by eight to obtain the real offset for the first byte of the datagram?
Consider the figure below with hosts A to F, and interfaces assigned IP and MAC addresses. Suppose all of the ARP tables are up to date and Host A sends a datagram to Host F. Give the source and destination MAC and IP addresses in the frame encapsulating this IP datagram as the frame is transmitted (i) from A to the left router, (ii) from the left router to the right router, and (iii) from the right router to F. E 192.168.1.001 00-00-00-00-00-00 192.168.2.001 44-44-44-44-44-44 192.168.3.001 77-77-77-77-77-77 Router 1 192.168.1.002 192.168.2.002 192.168.2.003 22-22-22-22-22-22 33-33-33-33-33-33 55-55-55-55-55 192.168.2.004 192.168.1.003 D 66-66-66-66-66 11-11-11-11-11-11 from A to Router 1 Router 1 to Router 2 LAN B Source MAC address Destination MAC address Source IP Destination IP LAN Router 2 LAN 192.168.3.002 88-88-88-88-88-88 F from Router 2 to F 192.168.3.003 99-99-99-99-99-99
Question 9 In three way handshake of establishing a TCP connection, if a client sends a SYN packet to a server with source port, destination port, sequence number, and acknowledgement number as the following respectively. 8971, 22, 156, 305 And also the SYN is acknowledged by a packet with sequence number 588. In the last step to set up the TCP connection, the client needs to send an ACK to the server. What are the values of source port, destination port, sequence number and the acknowledgement number of the ACK respectively? Question options: 22, 8971, 157, 589 8971, 22, 157, 589 8971, 22, 589, 157 8971, 22, 157, unknown
Consider each tier of the TCP/IP protocol stack and assign a priority to each layer based on your assessment of their importance. Is it possible to merge or separate any of these layers? Would the kind of data sent alter your ordering, and if so, how? Justify your ordering decision. Utilize the scale below: 1 represents the most critical factor, while 5 represents the least critical factor.
4. The original HTTP protocol used TCP/IP as the underlying protocol. For each page, graphic, or applet, a separate TCP connection was constructed, used, and terminated. This caused several problems: one referred to as the elephant and mice problem and two aspects of connection overhead. Describe both problems. Why were separate connections used? Would UDP rather than TCP be a good alternative? What solution would you propose to these problems to improve HTTP performance?
Consider the following 4-message protocol: A → S: (B, {(A, K1)}KpbS) S → B: A B → S: (A, {(B, K2)}KpbS) S → A: (B, {K2}K1) Which of the following statements is true, at the end of the protocol, and with regards to the purpose of the protocol: a) Both A and B establish a session key K2, and B is sure of A’s identity b) Both A and B establish a session key K1, and B is sure of A’s identity c) Both A and B establish a session key K1, and A is sure of B’s identity d) Both A and B establish a session key K1, and both B and A are sure of each other’s identity e) Both A and B establish a session key K2, and A is sure of B’s identity f) Both A and B establish a session key K1 g) Both A and B establish a session key K2 h) Both A and B authenticate each other by knowing each other’s identities i) A ends up knowing B’s identity j) B ends up knowing A’s identity k) None of the above l) All of the above
A UDP packet is to be sent to a network with MTU=1460 Bytes. The size of UDP data field is 2992 Bytes. Assume this packet is fragmented when traversing the network. Please give the values for the following IP header fields in each IP fragments: Total Length, MF and Offset. Note: Assume IPV4 is used. There is no option field in IP header, i.e., the size of IP header is 20 Bytes. The size of UDP header is 8 Bytes. All numbers are in decimal.

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	a	ESP Header , IP Header , TCP header , Data , ESP Tailer are Authenticated
	b	New IP HEeader , ESP Header , IP Header , TCP header , Data , ESP Tailer are Autheniticated
	c	New IP HEeader , ESP Header , IP Header , TCP header , Data , ESP Tailer, ESP AUTH are Autheniticated
	d	ESP Header , IP Header , TCP header , Data , ESP Tailer , ESP AUTH are Autheniticated