COMPUTERS AND TECHNOLOGY COLLEGE

"Packet switches have multiple links attached to them. For each attached link the packet switch has a/an ____________, which stores packets that the router is about to send into that link."link buffer

access buffer

output buffer

transmission buffer

none of the above

Answers

Answer 1
Answer:

Answer: Output buffer

Explanation:

Each packet switches contain multiple links which are attached to it and for individually attached link the output buffer basically store packets. Then, the router send these packets into multiple links.

In output buffer, if the packets are transmitted into the links but it finds that the link is busy with the another packet for transmission. Then, that particular packet needs to be wait in output buffer.

Therefore, the output buffer is the correct option.

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Assume hosts A and B are each connected to a switch Svia 100-Mbps links. The propagation delay on each link is 25μs. The switch Sis a store-and-forward device and it requires a delay of 35μs to process a packet after is has received the last bit in the packet. Calculate the total time required to transmit 40,000 bits from Ato B in the following scenarios. (The total time is measured from the start of the transmission of the first bit at A, until the last bit is received at B. We always assume that links are bi-directional with the same transmission rate and propagation delay in each direction unless specifically instructed otherwise.)

Answers

Answer:

885 μs

Explanation:

Given that:

Switch via = 100 Mbps links

The propagation delay for each link = 25μs.

Retransmitting a received packet = 35μs

To determine:

The total time required to transmit 40,000 bits from A to B.

Considering the fact as a single packet:

Transmit Delay / link = size/bandwith

= 4×10⁴ bits / 100 × 10⁶ bits/sec

= 400 μs

The total transmission time = ( 2 × 400 + 2 × 25 + 35) μs

= (800 + 50 + 35) μs

= 885 μs

Which business application uses electronic tags and labels to identify objects wirelessly over short distances? A. Radio-frequency identification
B. Global positioning systems
C. Geographic information systems
D. Location-based services

Answers

Answer:

Option A (Radio Frequency Identification)

Explanation:

Option A (Radio Frequency Identification)

Radio Frequency Identification:

This technology uses radio waves to transfer data between a reader and movable items. The benefit of this technology is we do not require physical contact with items and scanner.

Components of RFID:

  • tags (computer chip)
  • Reader
  • Communication System
  • RFID software

There are two RFID standards:

  • Electronic Product Code (EPC) standard
  • International Standard Organization (ISO)

Host A and B are communicating over a TCP connection, and Host B has already received from A all bytes up through byte 126. Suppose Host A then sends two segments to Host B back-to-back. The first and second segments contain 80 and 40 bytes of data, respectively. In the first segment, the sequence number is 127, the source port number is 302, and the destination port number is 80. Host B sends an acknowledgment whenever it receives a segment from Host A. In the second segment sent from Host A to B, what are the sequence number, source port number, and destination port number?

Answers

Answer:

sequence number = 207

source port number = 302

destination port number = 80

Explanation:

The sequence number is 127 + 80 = 207

The source port number is 302, and the destination port number is 80.

You are troubleshooting network connectivity issues on a workstation. Which command would you use to request new IP configuration information from a DHCP server?

Answers

Answer:

ipconfig / release command will be used to request new IP configuration information from a DHCP server

Explanation:

The ipconfig /release sends a DHCP release notification to the client so that the client immediately releases the lease henceforth updating the server's status information . This command also mark the old client's id as being available. Thus, the command ipconfig /renew then request a new IP address.

A _____ area network is one step up from a _____ area network in geographical range.

Answers

Answer:

A metropolitan area network is one step up from a local area network in geographical range.

Explanation:

A metropolitan area network is one step up from a local area network in geographical range.

A network is a group of devices connected together for communication. Networks can be classified according to the area they cover, A metropolitan area network is smaller than a wide area network but larger than a local area network.

A local area network consist of computers network in a single place. A group of LAN network form a metropolitan network

A metropolitan network is a network across a city or small region. A group of  MAN form a wide area network.

Design an algorithm to find all the common elements in two sorted lists of numbers. For example, for the lists (2, 5, 5, 5)
and (2, 2, 3, 5, 5, 7), the output should be (2, 5, 5).

Answers

Answer:

while list1 not empty AND list2 not empty {

    if elements at leftmost positions are equal {

        pop element from list1

        pop element from list2

        add element to result_list

    } else {

        pop lowest value from list1 or list2

    }

}
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