Search & Filtering
1.how many network are there? What is their netmask.
2.how many hosts could there on each network.
3.determine which network address 141.137.67.124. belong to
4. What is broadcast for each network
use of Wireshark, a packet sniffer, to briefly examine the 802.11
Use the “wlan_packet_capture” file to answer the following questions. After opening the file, enter the string wlan in the filter field and then apply the filter. Find the first probe request message in the trace and use that to answer the following questions.
a. What are the MAC address fields in the 802.11 frame?
b. Which MAC address in this frame corresponds to the wireless host (give the hexadecimal representation of the MAC address for the host)?
i. To the access point?
ii. To the first-hop router?
use of Wireshark, a packet sniffer, to briefly examine the ethernet
Use the “ethernet_packet_capture” file to answer the following questions. After opening the file, find the first DHCP message in the trace and use that to answer the following questions
a. What is the 48-bit Ethernet source address of the frame?
b. What is the 48-bit destination address of the Ethernet frame?
c. Is this destination Ethernet address associated with the destination IP address?
d. Give the hexadecimal value of the two-byte Frame type field.
e. What upper layer protocol does this correspond to?
make decisions about what tasks need to be
performed. Making a decision in a C program
usually involves testing the value of one or
more variables. Which concept will be used?
Explain it with the help of suitable examples.
TCP
Open the “tcp_packet_capture” trace file and find the first HTTP GET message from the trace with
packet length equal to 517 bytes and sequence number 2398008939. Hint: To limit yourself to TCP
messages, enter the string tcp in the filter field and then apply the filter. Answer the following
questions:
a. What are the IP address and TCP port number used by the client computer to retrieve
the file? [1]
b. What is the next sequence number of the TCP SYN segment? (Give the relative sequence
number). [2]
c. What is the flag field set to? [1]
d. Based on the value of the fields what flags are set in this TCP message?
keyboard, Draw a flowchart to print code A as
1
st three digits and code B as last two digits.
Example: Input: 12345
Code A: 123 Code B:45
UDP
Open the “udp_packet_capture” trace file and select the first DNS query packet from the trace. Hint: To limit yourself to DNS packets, enter the string DNS in the filter field and then apply the filter.
a. By consulting the displayed information in Wireshark’s packet content field for this packet, determine the length in bytes of each of the UDP header fields.
b. By examining the UDP header explain whether or not UDP can provide reliability.
c. What is the maximum number of bytes that can be included in a UDP payload?
d. What is the protocol number (in hex) for UDP?
e. What is the source port number for the query?
f. What is the destination port number for the response?
HTTP
Open the “tcp_packet_capture” file and select the HTTP get message from the trace with Sequence Number: 3559289491. Hint: To limit yourself to http packets, enter the string http in the filter field and then apply the filter. To get the actual sequence number instead of the relative sequence number, right click go to protocol preferences and make sure the relative sequence numbers option is not selected.
a. What is the IP address of the machine that generated the HTTP request? [1]
b. What is the IP address of the server that will handle this request? [1]
c. Does the client request a persistent connection? [1]
d. How do you know? [1]
e. What operating system was this request sent from? [1]
shown in below figure:
Assume that the linked list is already sorted. Write your observations on the time complexity of
the algorithm.
Problem 4: Fibonacci Series always starts with 0 and 1, or in other words the first two terms of this series are 0 and 1. Next term in this series is found by adding two previous numbers. Following figure shows first 6 terms of the Fibonacci Series i.e. 0, 1, 1, 2, 3, 5, if we were to print only even numbers then the output will be 0, 2. Design the algorithm (pseudocode) for a program that prints even terms in Fibonacci series less than N. Where N is the number entered by the user. For example, If N is 75 then print 0, 2, 8, 34 (i.e. all even terms in Fibonacci series that are less than 20) If N is 20 then print 0, 2, 8 (i.e. all even terms in Fibonacci series that are less than 20) If N is 6 then print 0, 2 (i.e. all even terms in Fibonacci series that are less than 6)
#339914 on Dec 2023