Computer Networks

DNS (Domain Name System) is the internet's phonebook that translates human-readable domain names like google.com into IP addresses like 142.250.185.238 that computers use to communicate. Without DNS, we would need to memorize numerical addresses for every website we visit.

IBM InfoSphere Information Server Web Console uses port 9080 as the default HTTP port. This is the standard port configured during installation for accessing the Web Console interface. The other ports listed (1000, 8080, 1080) are not the default ports for this service.

LDAP (Lightweight Directory Access Protocol) is a protocol for accessing and maintaining distributed directory information services over a network. It provides a standardized way to query and modify directory services like Active Directory. The 'Lightweight' refers to its simpler implementation compared to the older X.500 DAP protocol.

SiteScope is an infrastructure monitoring tool that monitors system health and performance metrics, while nmon is a performance monitoring tool for AIX and Linux systems. Gomez and Keynote are primarily synthetic monitoring services focused on user experience and application performance from external locations, not infrastructure monitoring.

DataPower supports protocol transformations including MQ to HTTP (messaging to web services), HTTP to HTTPS (secure web services), and FTP to MQ (file transfer to messaging). Protocol mediation is a core ESB function that DataPower performs as an integration appliance.

IBM Message Broker (now IBM Integration Bus) provides message transformation and enrichment capabilities, intelligent message routing based on content or rules, and publish/subscribe patterns for event-driven architectures. These three capabilities form the core functionality of an enterprise service bus.

The question asks about TCP functions. In the context of Tandem/mainframe systems, TCP likely refers to a communications process that coordinates interactions between screen programs and server processes. Given the answer is 'All of the above', TCP performs all the listed coordination functions including with I/O devices, server processes, and PATHMON, and can execute SCOBOL programs.

The Terminal Control Program (TCP) in Tandem Pathway handles execution of SCOBOL programs, manages communications with I/O devices and PATHMON, and routes client requests to server processes. Since all of these operations fall under the standard responsibilities of the TCP, the correct answer is indeed all of the above.

The Requestor page (pxRequestor) is a system page created upon login that holds session-level details, including access roles, active rulesets, and HTTP protocol parameters. Thread and User pages contain application-level and context-specific data.

HL7 operates at Layer 7 (Application layer) of the OSI model. It defines how healthcare applications exchange information, focusing on the content and structure of clinical messages rather than network transport.

All listed items, including FTP, common files, and BITS, are optional or default features that can be configured as component services under an IIS installation to support file transfer, background downloads, and standard web operations. Therefore, all choices are IIS components.

SSL/TLS encrypts data in transit to ensure confidentiality and integrity between client and server. Plain HTTP 1.0 and HTTP 1.1 send data in cleartext without encryption, while HTTP Keep-Alive is a connection management feature rather than a security protocol.

Session hijacking specifically means taking over an existing TCP session between a client and server. The attacker steals or intercepts session tokens (like session IDs or cookies) to impersonate the victim. Monitoring (A, B) is passive observation, not takeover. UDP (C) is connectionless and doesn't maintain sessions in the same way TCP does. Session hijacking targets the stateful nature of TCP connections.

Wi-Fi Protected Access (WPA) is the correct answer as it provides significantly stronger security than WEP. WEP (both 'Wireless Encryption Protocol' and 'Wired Equivalent Privacy' in options A and B) has well-known cryptographic weaknesses and can be cracked in minutes. WPA introduced TKIP encryption and improved authentication. Note that options C and D both refer to WPA - option D has a minor naming error ('Wireless' instead of 'Wi-Fi') making C the most technically accurate answer.

UDP lacks TCP's handshake and sequence number mechanisms, making source IP spoofing trivial for attackers. In TCP, the three-way handshake with SYN/SYN-ACK/ACK and sequence numbers makes it difficult to successfully spoof a source address and complete a connection. UDP's connectionless, fire-and-forget design (C) means there's no handshake to validate the source - any packet is accepted regardless of its claimed origin. While worm propagation (A) can use UDP, it's a consequence rather than the root cause of the larger attack surface. Option B is incorrect because UDP is connectionless.