in the DHCP servers, the bound state means The sever sends DHCPNACK message to the client O The clinet received acknowledgment from the server O The sever sends DHCPACK message to the client. The sever received acknowledgment from the client No option is correct 0 0 0 0 0

In IEEE 802.11, two-way communication is used to authenticate an open system. In order to authenticate the client, the server must give the station ID (typically the MAC address). Response to the client's previous request is either a successful or failed authentication response from the access point/router. An error may arise if, for example, an AP/router configuration does not include the client's MAC address.In what ways is it advantageous to use this kind of authentication scheme?In what ways does this authentication technique have security vulnerabilities that might be mitigated?

1. A network has a DHCP server that manages a Class C network for IP addresses it gives out. Over the course of a week, 75- 80 people with devices come and go and their devices connect to the network each day. Often, by Wednesday or Thursday, people complain about not being able to connect to the network. Why can the lease life parameter be causing the problem?

Q5. DHKE protocol Use these toy parameters to demonstrate how DHKE (Diffie-Hellman Key Exchange) works: a large prime number p key a = 5, Bob's secret key b = 4. What are their public keys? How can they come up with an agreed session key at the end of the protocol and what is the agreed session key? = 13 and a generator g = 2, (p and g are in public domain), Alice's secret %3=

Three-way handshake is used by a TCP client and a TCP server to establish a connection, as illustrated below: 1st: client:port1 -> server:port2, SYN 2nd: server:port2 -> client:port1, SYNACK 3rd: client:port1 -> server:port2, ACK When this client is performing scanning attacks, it will generated a large number of failed connections. In each failed connection, the three-way handshake fails to complete. People commonly use SYN together with the absence of its corresponding SYNACK in this same TCP session to identify whether this connection is failed. By investigating the failed connections, an engineer finds that in legitimate/benign cases, if the server does not return SYNACK to the client, the client will not send the ACK packet after SYNACK (e.g., the 3rd packet above). Therefore, this engineer suggests that we can count the failed connections based on the following rules without considering SYNACK:

Draw a sequence diagram for the following scenario. In a network, two nodes communicate with each other. These are the sequence. 1) Node J sends ping message to Node L 2) Node L sends ICMP echo reply to node L. Now Node A is having the MAC address of Node L. 3) Node J starts TCP handshake with Node L by sending SYN message. 4) Node L sends (SYN+ACK) back to node J. 5) Node J sends the ACK to Node L.

Let's say that Host C is running a Web server that listens on port 80. Suppose that this web server is able to maintain persistent connections and responds to requests from both Host A and Host B. Is Host C sending all of the requests over the same connection, or are there many sockets in use? Do each of them have port 80 even though they are broadcast over separate sockets? It's something you need to discuss and provide some clarification on.

Three-way handshake is used by a TCP client and a TCP server to establish a connection, as illustrated below:                    1st: client:port1 -> server:port2, SYN                2nd: server:port2 -> client:port1, SYNACK                3rd: client:port1 -> server:port2, ACK  When this client is performing scanning attacks, it will generated a large  number of failed connections. In each failed connection, the three-way handshake fails to complete. People commonly use SYN together with the absence of its corresponding SYNACK in this same TCP session to identify whether this connection is failed.  By investigating the failed connections, an engineer finds that in legitimate/benign cases, if the server does not return SYNACK to the client, the client will not send the ACK packet after SYNACK (e.g., the 3rd packet above). Therefore, this engineer suggests that we can count the failed connections based on the following rules  without considering SYNACK: If a client:port1 sends…

Rule Direction In Out Out In Either ABCDE Src Addr Dest Addr Protocol Dest Port TCP TCP TCP TCP Any External Internal Internal External Any Internal External External Internal Any 80 >1023 80 >1023 Any Action Permit Permit Permit Permit Deny