Docker uses a client-server design. The docker client talks to the docker daemon, that will the work of building, running, and distributing your docker containers. The docker client and daemon will run on the same system, otherwise you will connect a docker consumer to a remote docker daemon. The docker consumer and daemon communicate using a REST API, over OS sockets or a network interface.

The docker daemon (dockerd) listens for docker API requests and manages docker objects like pictures, containers, networks, and volumes. A daemon may communicate with other daemons to manage docker services.

Scammers often impersonate legitimate organizations using free email services like @yahoo.com. "Yahoo Bank" is not a legitimate institution, and a real financial entity would use an official domain (e.g.,
@yahoobank.com). This is a textbook phishing/smishing attempt.
Reference - CEH v13 Official Study Guide:
Module 9: Social Engineering
Quote:
"Attackers often use free email services and impersonate authority figures to trick users. Always verify the sender's domain and context." Incorrect Options:
B). Irrelevant-legitimate people may be unknown too.
C). Responding increases risk.
D). It is not from a verified organization.
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CEH teaches that certain advanced intrusion evasion techniques rely on understanding how firewalls differentiate between new connections and established traffic. Most perimeter firewalls scrutinize SYN packets and initial HTTP requests but allow ACK packets from established sessions to pass with minimal filtering. ACK tunneling leverages this behavior by embedding malicious payloads inside ACK packets, which appear to be part of a legitimate, pre-established session. Because ACK packets are often considered
"safe," they bypass deep inspection engines, intrusion detection systems, and application-layer gateways. This method allows attackers to move data or commands covertly between compromised internal systems and external hosts. CEH references such evasion strategies when discussing bypassing stateful firewalls and making malicious traffic appear legitimate. Port knocking and SYN scans would initiate new connections- precisely what the firewall is heavily inspecting. ICMP flooding is noisy and easily detected. ACK tunneling is specifically designed for stealth and is aligned with red team tradecraft for avoiding packet-level inspection mechanisms.

The Blackjacking attack involves leveraging a compromised BlackBerry device and its connection through the BlackBerry Enterprise Server (BES) to tunnel back into the internal corporate network, bypassing perimeter firewalls. The tool used in this method is BBProxy.
BBProxy is installed on the BlackBerry device and establishes a covert tunnel via BES, allowing attackers to pivot into the internal LAN from outside the perimeter.
Reference - CEH v13 Official Study Guide:
Module 17: Hacking Mobile Platforms
Quote:
"Blackjacking is a technique in which attackers use BBProxy to exploit a trusted path from a BlackBerry device to the corporate LAN through BES." Incorrect Options Explained:
A). Paros Proxy is a web proxy used for intercepting HTTP/S traffic.
C). Blooover is used for Bluetooth security auditing.
D). BBCrack is used for password recovery on BlackBerry devices, not for tunneling.