Consider the SDN OpenFlow network shown in the Figure. Suppose we want switch s2 to function as a firewall. Specify the flow table entries in s2 that implements the following firewall behaviors for delivery of datagrams destined to h3 and h4. You do not need to specify the forwarding behavior in s2 that forwards traffic to other routers. [20] a. Only traffic arriving from hosts h1 and h6 should be delivered to hosts h3 or h4 (i.e., that arriving traffic from hosts h2 and h5 is blocked). b. Only TCP traffic is allowed to be delivered to hosts h3 or h4 (i.e., that UDP traffic is blocked). c. Only traffic destined to h3 is to be delivered (i.e., all traffic to h4 is blocked). d. Only UDP traffic from h1 and destined to h3 is to be delivered. All other traffic is blocked

Q: Q3. Suppose a client is communication with a server via a TCP Reno connection. The client has sent…

A: TCP Reno connection is used for congestion control management. It is based on window size, that is…

Q: Consider the Scenario network. Suppose all hosts A and B have such set timeout values. a. Argue…

A: Increasing the size of the router's finite buffer may potentially reduce throughput. Because of the…

Q: Consider the three-hop scenario shown below, where the first and third links have capacity R, and…

A: in hop-by-hop congnetion control just because of buffer overflow the sender does not perform the…

Q: Phases of TCP congestion control. Consider the figure below, which plots the evolution of TCP's…

A: Three duplicate Acknowledgement : Three duplicate ACK indicate  Mild congestion condition in this…

Q: The figure shows a TCP transaction. Assume Host A always has data to send, and each packet has size…

A: A)   Here since 2nd packet is lost,   ACK#1 = ACK#2 = ACK#3 =100 (sequence number of 2nd packet)…

Q: Consider the figure used to illustrate Web caching below. Suppose that the access link capacity is C…

A: The average total response time is the sum of link delay and propagation delay. Link delay = ( S/C )…

Q: Detailed assessment involves scanning all 65,536 TCP and SCTP ports for each IP address within…

A: We have an IP addresses, and then many ports on that IP addresses.

Q: On a regular basis, Distance Vector delivers its entire routing table to all active interfaces.…

A: All dynamic routing protocols are built around an algorithm. Generally, an algorithm is a…

Q: Let's pretend Host C is running a Web server on port 80. Suppose this Web server allows both Hosts A…

A: Enduring relationship Each persistent connection receives its own connection socket from the web…

Q: It is possible to define flows on either a host-to-host basis or on a process-to-process basis. (a)…

A: If a data packet gets transferred from one source to a destination, then the IP address of the…

Q: Suppose A, R, and B are as in the previous exercise, except that R's queue now has a size of three…

A:

Q: datagra

A: Dear Student, The answer to your question is given below -

Q: Suppose an HTML file references two very small objects on the same server (total 3 object including…

A: Introduction The Hypertext Transfer Protocol (HTTP) is indeed an application layer protocol that…

Q: 1. In TCP Fast Retransmit, if we receive three duplicate ACKS after sending out a packet that is not…

A: Answer 1. Since TCP doesn't descry that a indistinguishable ACK is caused by a missing element or…

Q: Assume that a host C method has a UDP socket with port number 6789. Assume that both host A and host…

A: The answer is given below.

Q: A datagram subnet allows routers to drop packets whenever they need to. The probability of a router…

A: According to the question, we have to find (a) hops a packet makes per transmission (b)…

Q: Consider a simple protocol for transferring files over a link. After some initial negotiation, A…

A: Stop-and-wait stop and wait, implies, that anything the information that the shipper needs to send,…

Q: Please draw a sequence diagram for the following scenario. In a network, two nodes communicate with…

A: A sequence diagram is a type of interaction diagram that shows how objects or components of a system…

Q: Host A sends the information of size 3000 bytes to Host B using TCP protocol. As long as Host B…

A: Please find the answer in step 2

Q: Consider a local network with a 1 Gbps access link to the Internet. Hosts on this network are…

A: The LAN is mainly of two types wired LAN and wireless LAN. The wired LAN uses switches, servers, and…

Q: 4. The original HTTP protocol used TCP/IP as the underlying protocol. For each page, graphic, or…

A: Let's see the answer:

Q: e destination host. If either of the routers discards a packet, the source host eventually times out…

A:

Q: A. During which of the following intervals of time is TCP performing slow start"? B. During which of…

A: The question is asking to identify the intervals of time during which TCP is performing slow start,…

Q: Suppose a router has n input ports each with identical line speeds, n output ports each with…

A: answer : -  D. there is no queuing delay in the router.

Q: 2. In the figure below, Host A has a UDP Echo client while Host B has a UDP Echo server. The UDP…

A: The whole amount of time needed for a data packet to travel from a source to a destination and back…

Q: Assume that when establishing a TCP connection, the threshold for the Congestion Window (cwnd) is 1&…

A: Packets can arrive out of order from the IP layer. So whenever an out of order packet would be…

Q: Most IP datagram reassembly algorithms have a timer to avoid having a lost fragment tie up…

A: The receiver will have no record left of fragments with this identifier, so it will buffer it,…

Q: Most IP datagram reassembly algorithms have a timer to avoid having a lost fragment tie up…

A: Find your Answer below

Q: bps, where S=10-R. Further suppose that the TCP receive buffer is large enough to hold the entire…

A: The answer is..

Q: A frame containing http request is sent from Computer (A) [in whichever subnet it is now, make sure…

A: Assuming the switch is AP1, thus the MAC address of the switch is M1. The frame traveling from…

Q: Consider the situation in the previous exercise, except this time assume that the router has a queue…

A:

Q: For each of the three general approaches we studied for broadcast communi- cation (uncontrolled…

A: Uncontrolled Flooding:  A node may receive multiple copies of the same packet is TRUE. Reason:  The…

Q: Try to write rules as general as possible. For example, although there are only two nodes outside,…

A: Rule 1: Block ping (ICMP) packets being forwarded between two subnets as follows: It is often…

Q: Consider the Go-Back-N protocol, with a window size N = 50. Suppose 30 packets are sent, but the…

A: Here we use Go-back-N protocol: ========================================== given that window size=50…

Q: b) TCP demultiplexing. Suppose a process in host C has a TCP socket with port number 787. Suppose…

A: Given that, host C has a TCP socket with port number 787. Host A and Host B each send a TCP segment…

Q: DoS attack has been reported against FTP server 192.168.56.1. FTP traffic spikes were seen prior to…

A: A Denial-of-Service (DoS) attack is an attack meant to shut down a machine or network, making it…

Q: Consider a simple protocol for transferring files over a link. After some initial negotiation, A…

A:

Q: Consider an IP datagram with the following characteristics: Length of IP header: 20 bytes Total…

A: The Answer is

Q: EL is not cached ose that three C DNS server vis d third DNS co

A: Total elapsed time= RTT0+RTT1+RTT2+RTTn Total response time for this will be= 2*RTTHTTP = 9 msecs +…

Q: In this problem we investigate whether either UDP or TCP provides a degree of end-point…

A:

Q: If host A receives two SYN packets from the same port from remote host B, the second may be either a…

A:

Q: Draw a sequence diagram for the following scenario. In a network, two nodes communicate with each…

A: A sequence diagram is a visual representation that illustrates the order of interactions between…

Q: Consider an IP packet with a length of 4,500bytes that includes a 20-byteIPv4 header ans 40-byte TCP…

A: Here total number of payload allowed in each fragment = floor (600-20/8) *8 = 576 Bytes. 576 Bytes…

Q: Suppose two TCP connections share a path through a router R. The router's queue size is six…

A: Let’s say that two TCP connections share a path through a router R. A router’s queue size is six…

Network Security

The word "network security" refers to a wide range of technology, devices, and processes. In its most basic form, it is a combination of rules and configurations that use both hardware and software technologies to safeguard the confidentiality, integrity, and accessibility of computer networks and data. Every company, regardless of sector, size or infrastructure, needs network security solutions to protect itself from the ever-increasing landscape of cyber threats that exist today.