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ICND1 – TCP & UDP Questions

June 25th, 2017 in ICND1 100-105 Go to comments

Question 1


Three types of flow control are buffering, windowing & congestion avoidance:

+ Buffering: If a device receives packets too quickly for it to handle then it can store them in a memory section called a buffer and proceed them later.

+ Windowing: a window is the quantity of data segments that the transmitting device is allowed to send without receiving an acknowledgment for them. For example:

With the window size of 1, the sending device sends 1 segment and the receiving device must reply with 1 ACK before the sending device can send the next segment. This “waiting” takes some time.

By increasing the window size to 3, the sending device will send up to 3 segments before waiting an ACK -> helps reduce the waiting time.

+ Congestion avoidance: lower-priority traffic can be discarded when the network is overloaded -> minimize delays.

Question 2

Question 3


HTTP is based on TCP connection so a TCP connection must be established first between the workstation and the web server.

Question 4


Before two computers can communicate over TCP, they must synchronize their initial sequence numbers (ISN) -> B is correct.

TCP uses a sequence number to identify each byte of data. The sequence number identifies the order of the bytes sent from each computer so that the data can be reconstructed in order, regardless of any fragmentation, disordering, or packet loss that may occur during transmission -> D is correct.

Question 5

Question 6

Comments (6) Comments
  1. chuck
    July 30th, 2017

    Question 6. The TCP/IP protocols are not loaded??

  2. jde
    July 30th, 2017

    Question 6. I don’t understand why E is the correct answer?

  3. KL
    August 23rd, 2017

    to jde
    you can try the following steps in you computer
    1> from cmd line, you can ping which is your loopback address
    2> go to network connections,
    3> click the LAN and un-select the TCP/IPv6 and TCP/IPv4
    4> no you are not able to ping from cmd line.

  4. Hyatt
    September 23rd, 2017

    Hi, could someone please explained to me Question 6 answer of E and not C?

  5. Anonymous
    November 2nd, 2017

    can someone send me 101 -105 VCE dumps I have the VCE engine which I purchased for a high amount , you can send them on joseoluoch at gmail dot com please I am trying to re certify asap before end of the year

  6. quanghuy147
    January 5th, 2018

    Hi Hyatt,
    To my understanding, is the local loopback address, one of the purposes of that address is to test TCP/IP stack on the local computer. It is not an address for routing.

    If you can ping , it means your TCP/IP stack is good but it only ‘local’, which means it does not guarantee you are connected to other devices.

    **By ‘local’ I mean ‘within the host only’ .