What is the main disadvantage in using NAT to extend IP addresses? O IP addresses of devices in the local network is not visible to the outside world. Extra overhead is incurred by the NAT router to convert from internal IP addresses to external IP addresses and vice versa. Only one IP address can be used by the outside world to communicate with devices in the local network. O It violates the layering principle.

What is the main disadvantage in using NAT to extend IP addresses? O IP addresses of devices in the local network is not visible to the outside world. Extra overhead is incurred by the NAT router to convert from internal IP addresses to external IP addresses and vice versa. Only one IP address can be used by the outside world to communicate with devices in the local network. O It violates the layering principle.

Comptia A+ Core 1 Exam: Guide To Computing Infrastructure (mindtap Course List)

10th Edition

ISBN:9780357108376

Author:Jean Andrews, Joy Dark, Jill West

Publisher:Jean Andrews, Joy Dark, Jill West

Chapter8: Network Infrastructure And Troubleshooting

Section: Chapter Questions

Problem 8TC

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1 Consider the NAT scenario below. IP datagrams being sent from, or destined to, these three private hosts must pass through the NAT router. Suppose that the host with IP address 192.168.0.3 sends an IP datagram to a host on the Internet with 170.109.109.77. Show the Source (S) and the Destination (D) IPs in steps 2 and 4 only. NAT translation table WAN side addr LAN side addr 140.5.78 99 192.168.0 4 TYCO 192.168.0 4 D 1005-78.99
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Assume that a private internet requires that the messages at the application layer be encrypted and decrypted for security purposes. If we need to add some information about the encryption/decryption process (such as the algorithms used in the process), does it mean that we are adding one layer to the TCP/IP protocol suite? Redraw the TCP/IP layers (Figure 2.4 part b) if you think OS
NAT has many advantages. However, it also has some limitations. Therefore, answer thefollowing regarding the NAT traversal problem. 1) What is the port forwarding mechanism? Explain the command used for enabling the portforwarding on the networking devices used in practice.
1. What is the difference between packet fragmentation (i.e., at network layer) and frame frag- mentation (i.e., at link layer) in terms of purpose? 2. Suppose that host A is connected to a router R1, R1 is connected to another router, R2, and R2 is connected to host B. Suppose that a TCP message that contains 800 bytes of data and 20 bytes of TCP header is passed to the IP function at host A for delivery to B. Show the Total length, DF, MF, and Fragment offset fields of the IP header in each packet transmitted over the three links. (Assume that link A-R1 can support a maximum frame size of 1024 bytes including a 14-byte frame header, link R1-R2 can support a maximum frame size of 512 bytes, including an 8-byte frame header, and link R2-B can support a maximum frame size of 432 bytes including a 12-byte frame header.) (*hint: the Fragment offset field is denominated by 8-bytes, not bytes) 3. What is the purpose of the path MTU discovery process (see textbook Figure 5-42) and why does…
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Consider the network setup in the following figure where the router is NAT-enabled. Suppose each host has two ongoing TCP connections, all to port 80 at host 128.119.40.86. Provide the six corresponding entries in the NAT translation table. Assume that the router assigns port number starting from 3000 and each host assigns port number starting in 5000
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The maximum value of a TTL for a DNS resource record (RR) is 2147483647 seconds. What is the primary drawback of using this TTL? а. This TTL is approximately equal to 68 years. Once local DNS servers receive this TTL, any changes made to the name-to-IP-address mapping by a DNS administrator will not be seen by clients whose local DNS server has cached this RR. O b. There aren't enough bits in the DNS RR to represent a TTL this large. A TTL this long would cause too many DNS servers to cache this RR. с. O d. A TTL of this size would cause too many queries to go to the root servers.
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