Consider accessing your e-mail with POP3. Suppose you have configured your mail client to operate in the 'download-and-delete' mode. When the client (C) fetches all emails from the server (S), the sequence of messages exchanged starts as follows. C: list S: 1 498 S: 2 912 S: C: retr 1 S: blah blah ... blah S: ? How many messages does the server store for the client? It cannot be known 912 1 498 None of the mentioned

3. Consider the M/M/1 queue discussed in class. Assume that packets arrive to a queue with average arrival rate A [pkts/s]. The average service rate of the queue is denoted by u [pkts/s]. (a) Write expressions for: (i) the mean time between packet arrivals to the queue, i.e., the average inter-arrival time; and (ii) the mean service time, i.e., the average time needed to transmit a packet onto the outgoing link. (b) Let N denote the number of packets in the system in steady-state. Suppose A = 850 and u 1000. Find the smallest value of B such that P(N > B) < e = 10¬4. Hint: Use MATLAB or some other computational tool (you could even use an Excel spreadsheet) to test different values of B. 4. Consider the M/M/1 queue from Problem 3. (a) Find an expression for E[N], i.e., the average number of packets in the system in steady- state. For the values of A and µ specified in Problem 4(b), compute the value of E[N]. What happens when A→ µ? (b) Find an expression for Var[N], i.e., the variance…

I am using SwaggerHub for API documentation for my web application. When I use the bearer token for authentication, and I run a get request that is supposed to return a JSON of the user's trip information. It returns a 200 HTTP response, but the body response does not return the JSON information, instead it returns HTML text. The image below shows the result. Why is this happening?

If you're sending a huge file, you'll need to use cypher block chaining or cypher feedback mode. By how much is one more efficient?

Suppose an HTTP client makes a first GET request to the gaia.cs.umass.edu web server for a base page that it has never before requested, which contains an embedded object, which causes the client to make a second GET request. A very short time later, the client then makes a third GET request - for the same base page, with that third GET request having an  If-Modified-Since field (as does the 4th GET request that the client makes for the embedded object).  Neither the base object nor the jpeg object has changed. How many round trip times (RTTs) are needed from when the client first makes the third GET request (i.e., when it requests the base object for the second time) to when the base page and the jpeg file are displayed a second time, assuming that: any time needed by the server to transmit the base file, or the jpeg file into the server's link is (each) equal to 1/2 RTT the time needed to transmit an HTTP GET into the client's link is zero? the time needed by the server to transmit…