Explanation/Reference:
Explanation:
Client-server networking is also known as client-server computing. It is a distributed application architecture that partitions tasks or workloads between service providers (servers) and service requesters, called clients.
Often clients and servers operate over a computer network on separate hardware. A server machine is a high- performance host that is running one or more server programs which share its resources with clients. A client does not share any of its resources, but requests a server's content or service function. Clients therefore initiate communication sessions with servers which await (listen to) incoming requests.
Answer options D and B are incorrect. Peer-to-peer (P2P) computing or networking is a distributed application architecture that partitions tasks or workloads between peers. Peers are equally privileged, equipotent participants in the application. They are said to form a peer-to-peer network of nodes. Peer-to-peer networking (also known simply as peer networking) differs from client-server networking, where certain devices have the responsibility to provide or "serve" data, and other devices consume or otherwise act as "clients" of those servers.

Asymmetric
Explanation:
Asymmetric encryption is a type of encryption that uses two keys, i.e., a public key and a private key pair for
data encryption. The public key is available to everyone, while the private or secret key is available only to the
recipient of the message. For example, when a user sends a message or data to another user, the sender
uses the public key to encrypt the data. The receiver uses his private key to decrypt the data.

rootkit
Explanation:
A rootkit is a set of tools that take Administrative control of a computer system without authorization by the
computer owners and/or legitimate managers. A rootkit requires root access to be installed in the Linux
operating system, but once installed, the attacker can get root access at any time. Rootkits have the following
features:
They allow an attacker to run packet sniffers secretly to capture passwords.
They allow an attacker to set a Trojan into the operating system and thus open a backdoor for anytime access.
They allow an attacker to replace utility programs that can be used to detect the attacker's activity.
They provide utilities for installing Trojans with the same attributes as legitimate programs.

A sniffer is a software tool that is used to capture any network traffic. Since a sniffer changes the NIC of the LAN card into promiscuous mode, the NIC begins to record incoming and outgoing data traffic across the network. A sniffer attack is a passive attack because the attacker does not directly connect with the target host. This attack is most often used to grab logins and passwords from network traffic. Tools such as Ethereal, Snort, Windump, EtherPeek, Dsniff are some good examples of sniffers. These tools provide many facilities to users such as graphical user interface, traffic statistics graph, multiple sessions tracking, etc. Answer option C is incorrect. An intrusion prevention system (IPS) is a network security device that monitors network and/or system activities for malicious or unwanted behavior and can react, in real-time, to block or prevent those activities. When an attack is detected, it can drop the offending packets while still allowing all other traffic to pass. Answer option B is incorrect. An IDS (Intrusion Detection System) is a device or software application that monitors network and/or system activities for malicious activities or policy violations and produces reports to a Management Station. Intrusion prevention is the process of performing intrusion detection and attempting to stop detected possible incidents. Intrusion detection and prevention systems (IDPS) are primarily focused on identifying possible incidents, logging information about them, attempting to stop them, and reporting them to security administrators. Answer option D is incorrect. Warchalking is the drawing of symbols in public places to advertise an open Wi-Fi wireless network. Having found a Wi-Fi node, the warchalker draws a special symbol on a nearby object, such as a wall, the pavement, or a lamp post. The name warchalking is derived from the cracker terms war dialing and war driving.