Are we within CG?

What was your favorite part about 102 class? What is something that your learned that you will take with yourself to the next flight course?

In Wireless slides, Code Division Multiple Access (CDMA) is introduced on slides 20 & 21. Please show the procedures that receiver 2, who has the same code as sender 2, can recover the encoded data. Assume sender 1 has the code -1,+1,-1,-1,+1,-1,-1, +1 , and sender 2 has the code +1,-1,+1, -1, +1,+1,-1,+1. Assume sender 1 sends 2 bits +1, -1, and sender 2 sends 2 bits -1, +1. a.    (4 pts) What is the encoded data sent by sender 1 and sender 2? Fill the blank, and then show your work in the following blank. i.    Sender 1: ___________________________________________ ii.    Sender 2: ___________________________________________     b. (4 pts) What is the “channel output”, i.e., the data that is sent on the channel that combines both sender 1 and sender 2’s data. Fill the blank and show your work below. Channel output: ___________________________________________   c. (5 pts) Show that receiver 1, who has the same code as sender 1, can recover the received data.

In class, we have discussed an ideal multiple access protocol (in the link layer) should have the following characters: 1. When only one node wants to transmit, it can send at rate R (full speed), and 2. Fully decentralized. Which of the following protocol fulfill these two characteristics?

What are the two main functions of the network layer (choose two)? 

Which cryptography algorithms are used for digital signatures?

A network administrator is adding a new LAN to a branch office. The new LAN must support 25 connected devices. What is the smallest network mask that the network administrator can use for the new network?

Reliable Data Transfer: RDT 3.0 Consider the RDT 3.0 protocol, for reliably communicating data from a sender to a receiver over a channel that can lose or corrupt packets in either direction, and when the maximum delay from sender to receiver and back is not known. The FSMs for the sender and receiver are shown below, with their transitions labeled as SX and RY, respectively.    Now let’s consider the sequence of sender and receiver transitions that would happen when one or more of the following complications occur: a packet (data or ACK) is lost, a timer times out (prematurely or not), or a message is corrupted. One or more of these events has occurred to produce the sequence of transitions below. In the sequence below, one transition has been omitted and replaced with a “*”. If the following transition sequence is missing a transition, which one is it? (To indicate the missing transition, enter S or R, followed by an index.). And explain your choice. Transition Sequence: S0, R0, S2, R1, S3, *, S5, R2, S8 Missing transition is:   Explanation:              

What is the NAT protocol used for?

Communication consists of: