4.3-2b. Network Address Translation (b). Consider the following scenario in which host 10.0.0.1 communicating with an external web server at IP address 128.119.40.186. The NAT table show the table entry associated with this TCP flow. What are the source and destination IP address a port numbers at point B? NAT translation table WAN side addr 138.76.29.7, 5051 10.0.0.1, 2020 LAN side addr

please answer carefully

Suppose you open your BMCC mailbox first thing on a Monday morning and find that your messages have arrived. Assuming the BMCC server does not have access to the MAC address of the device reading these emails. Explain in detail how the ARP protocol determines which device on the LAN will be the recipient of incoming Internet data. After 22 years, the transition to IPv6 addressing is complete for around 30 percent of Internet traffic. When comparing IPv4 and IPv6 address headers, the Ethernet frames' Maximum Transmission Unit (MTU) stands out as a potential stumbling block.

6.3B-4. Multiple Access protocols (4). Consider the figure below, which shows the arrival of 6 messages for transmission at different multiple access wireless nodes at times t=0.1, 0.8, 1.35, 2.6, 3.9, 4.2. Each transmission requires exactly one time unit. t=0.0 1 U r 1 U 3 2 4 Again consider the CSMA protocol (without collision detection), indicate those packets where the channel is sensed busy and therefore, under CSMA, that message transmission is not attempted. [Again, you should assume that it takes .2 time units for a signal to propagate from one node to each of the other nodes. You can assume that if a packet experiences a collision or senses the channel busy and that that node will not attempt a retransmission of that packet until sometime after t=5. Hint: consider propagation times carefully here]. 5 2 3 a t=1.0 t=2.0 4 t=3.0 56 t=4.0 t=5.0

6.3B-5. Multiple Access protocols (5). Consider the figure below, which shows the arrival of 6 messages for transmission at different multiple access wireless nodes at times t=0.1, 0.8, 1.35, 2.6, 3.9, 4.2. Each transmission requires exactly one time unit. t=0.0 n [ 2 3 t=1.0 4 t=2.0 4 For the CSMA/CD protocol (with collision detection), indicate which packets are successfully transmitted. You should assume that it takes .2 time units for a signal to propagate from one node to each of the other nodes. You can assume that if a packet experiences a collision or senses the channel busy and that that node will not attempt a retransmission of that packet until sometime after t=5. If a node senses a collision, it stops transmitting immediately (although it will still take .2 time units for the last transmitted bit to propagate to all other nodes). Hint: consider propagation times carefully here. Hint: consider propagation times carefully here. t=3.0 5 6 t=4.0 t=5.0

4.3-2a Network Address Translation (a). Consider the following scenario in which host 10.0.0.1 is communicating with an external web server at IP address 128.119.40.186. The NAT table shows the table entry associated with this TCP flow. What are the source and destination IP address and port numbers at point A? S: D: B S: D NAT translation table WAN side addr 138.76.29.7, 5051 10.0.0.1, 2020 138.76.29.7 The source IP address is: The destination IP address is: The source port number is: LAN side addr The destination port number is: 10.0.0.4 S D: S: D: [Choose ] [Choose] 5051 80 128.119.40.186 2020 10.0.0.4 10.0.0.1 138.76.29.7 10.0.0.1 10.0.0.2 10.0.0.3