What does a datagram header's Time-to-Live (TTL) field indicate? O The time in which a HTTP cookie record expires. O The elapse time to discard cached HTTP responses. O The hop limit value of a network packet. O The time in which IP-to-MAC address mapping is reset. O The time in which domain resolver may cache the answer.

What does a datagram header's Time-to-Live (TTL) field indicate? O The time in which a HTTP cookie record expires. O The elapse time to discard cached HTTP responses. O The hop limit value of a network packet. O The time in which IP-to-MAC address mapping is reset. O The time in which domain resolver may cache the answer.

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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Provide short answers to the following: How do you determine whether an IP address is a multicast address?==solve What is the TTL field in the IP header used for?==solve What is the maximum length of options bytes that can be carried in an IPv4 header?==solve 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?====need to solve this question
Briefly explain the TCP/IP model and the functions of each layer? Considering communication with client-server connectionless (datagram) sockets, draw a flowchart for the client and server? What is the purpose of the hash function? And how does it work? Briefly describe the man in the middle attack with a suitable example?
P14. Consider sending a 2400-byte datagram into a link that has an MTU of 700 bytes. Suppose the original datagram is stamped with the identification number 422. How many fragments are generated? What are the values in the various fields in the IP datagram(s) generated related to fragmentation?
13.9 What is the purpose of an IP address mask? Suppose an IP address is identified as 222.44.66.88/24. What is the network address in this case? What is the host address? How many hosts can this network address support? Repeat this exercise for the IP address 200.40.60.80/26. 13.10 Explain the concept of a DHCP lease. How is it obtained? How is it used? What does it provide? 14.5 In recent years, much of the storage and communication of data has been in digital form, even if the source data is actually analog. Even most television is now transmitted digitally. What benefits and advantages are gained by using digital storage and signaling?
14.3. What is the header overhead in the IP protocol? 14.5. Because of fragmentation, an IP datagram can arrive in several pieces, not necessarily in the correct order. The IP entity at the receiving end system must accumulate these fragments until the original datagram is reconstituted. Consider that the IP entity creates a buffer for assembling the data field in the original datagram. As assembly proceeds, the buffer will contain blocks of data and “holes” between the data blocks. Describe an algorithm for reassembly based on this concept. For the algorithm in part (a), it is necessary to keep track of the holes. Describe a simple mechanism for doing this. 14.13. Provide the following parameter values for each of the network classes A, B, and C. Be sure to consider any special or reserved addresses in your calculations. Number of bits in network portion of address Number of bits in host portion of address Number of distinct networks allowed Number of distinct hosts per network…
It is important to keep in mind that the reordering and reassembly of packets takes place during the transport step of the TCP/IP protocol suite. The Internet or the data layer are two examples of lower levels of abstraction that a firewall is able to function at. If a traffic stream is either out of order or has been deleted, a firewall that uses stateful inspection will be unable to determine anything about the stream's contents.
Fill the Blank __________ is the command-line tool to explicitly retrieve and display DNS records. _______________ is the command-line tool to display the route and measure transit delays of data packets across the Internet between the local host and a remote host. IP provides an end-to-end logical communication between ____________________________ while TCP provides an end-to-end logical communication between _______________.
QUESTION 54 Network layer provides two basic functionalities (_______), and(_______) QUESTION 55 Network layer consists of two planes:(_________) , and(_______). QUESTION 56 What is AIMD in TCP stands for? What is the main purpose of it? QUESTION 57 Link layer uses IP for source and destination addresses True False QUESTION 58 SHA-1 is a Cryptographic hash function True False QUESTION 59 CRC is a cryptographic hash function True False
Distinguish between DNS records of different kinds. Each of them will be briefly discussed, with examples and arguments provided for their application. Having the same hostname alias for both your web and mail servers is feasible inside the same company.
1. Encode the following message in base64 01010111 00001111 11110000 2. The following is a dump (contents) of a UDP header in hexadecimal format 0045DF0000580000 a. what is the source port number? b. what is the destination port number? c. what is the total length of the user datagram? d. what is the length of the data? e. what is the application layer protocol? 3.Why does the network-layer protocol need to provide packetizing service to the transport layer? 4. List four types of delays in a packet-switch network.
What does the ip ospf priority command accomplish?Describe the necessity of Network Address Translation (NAT) for IPv4 in your own words (at least two reasons). Can you back up your assertion with examples?
Check all of the phrases below that state a true property of a local DNS server. Group of answer choices A.The local DNS server can decrease the name-to-IP-address resolution time experienced by a querying local host over the case when a DNS is resolved via querying into the DNS hierarchy. B.The local DNS server holds hostname-to-IP translation records, but not other DNS records such as MX records. C.The local DNS server record for a remote host is sometimes different from that of the authoritative server for that host. D. The local DNS server is only contacted by a local host if that local host is unable to resolve a name via iterative or recursive queries into the DNS hierarchy.