Suppose there are two ISPS providing WiFi access in a particular café, with each ISP operating its own AP and having its own IP address block. A. Further suppose that by accident, each ISP has configured its AP to operate over channel 11. Will the 802.11 protocol completely break down in this situation? Discuss what happens when two stations, each associated with a different ISP, attempt to transmit at the same time. B. Now suppose that one AP operates over channel 1 and the other over channel 11. How do your answers change?

Suppose there are two ISPS providing WiFi access in a particular café, with each ISP operating its own AP and having its own IP address block. A. Further suppose that by accident, each ISP has configured its AP to operate over channel 11. Will the 802.11 protocol completely break down in this situation? Discuss what happens when two stations, each associated with a different ISP, attempt to transmit at the same time. B. Now suppose that one AP operates over channel 1 and the other over channel 11. How do your answers change?

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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Suppose there are two ISPS providing WiFi access in a particular café, with each ISP operating its own AP and having its own IP address block. A. Further suppose that by accident, each ISP has configured its AP to operate over channel 11. Will the 802.11 protocol completely break down in this situation? Discuss what happens when two stations, each associated with a different ISP, attempt to transmit at the same time. B. Now suppose that one AP operates over channel 1 and the other over channel 11. How do your answers change?
Given a scenario where there are two ISPs each running its own Access Point, and each using its own block of IP addresses. Consider that each Access Point was configured to run over channel 1, by each of the ISPs. Would the 802.11 protocol completely break down in this scenario? Explain using the following: if there are two stations, each associated with a different ISP, describe what happens when they both attempt to transmit at the same time. Suppose instead that one Access Point was configured to run over channel 1 and the other over channel 11. How do your answers in part a change using this scenario? Please answer question 1 and 2.
With Network Address Translation, a router changes a private IP address in the IP header to the public IP address of the router, and the source port number (TCP or UDP) is changed to a port number selected by the router. Assuming the transport layer protocol being used is UDP, what other field of the UDP header may need to be changed? a. Length O b. Destination port Checksum с.
Assume that a Host A contacts a name server B to get a cached DNS response (i.e., B does not have to go to the root name server, TLD name server, or authoritative name server to get a response). Suppose that A and B can communicate using UDP or TCP. However, any packet sent from A to B or from B to A has an independent chance of being lost of 10%. Let the round trip time for a packet to go from A to B and back (or B to A and back) be RTT. Let A start at a time = 0s. When the time is 2RTT, which of TCP or UDP is the better option for A to get the DNS response from B? Better here means higher probability of correctly receiving the DNS response
With Network Address Translation, a router changes a private IP address in the IP header to the public IP address of the router, and the source port number (TCP or UDP) is changed to a port number selected by the router. Assuming the transport layer protocol being used is UDP, what other field of the UDP header may need to be changed? a. Destination port O b. Checksum O c. Length
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A simple CIDR routing table is shown in Figure 1. For each of the destination IP addresses below, indicate which entry in the table it matches. Indicating none if no routing entry can be matched (hint: given an IP packet, the router will check whether there is a routing entry which can be used to route this packet, by checking the destination IP address in the packet with each routing entry: based on the subnet mask of each routing entry, it can extract the network ID and compare it with each routing entry; if there are a few routing entries which can match, the entry with the longest subnet mask wins). Address Mask Output Port 10.19.0.0/16 1 10.19.128/17 2 10.19.192/18 3 10.19.192/19 4 0.0.0.0/1 5 141.219.2.10 10.10.10.10 10.19.86.141 10.19.193.6 10.19.255.86 10.19.192.18
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?
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