Computer Networks

Bluetooth operates in the 2.4-2.48 GHz ISM (Industrial, Scientific, Medical) band. 2.45 GHz is the center frequency commonly cited. Options in MHz (megahertz) would be 1000x too small. BHz is not a standard unit. Hz alone is far too low. This is the same band used by WiFi and microwaves.

Blue bugging is a Bluetooth security attack where an unauthorized remotely connects to a Bluetooth-enabled phone to make calls, access data, or eavesdrop. Blue tagging and blue error are not standard Bluetooth security terms. This vulnerability exists in devices with vulnerable Bluetooth implementations.

Bluetooth technology is standardized under IEEE 802.15, which covers wireless personal area networks (WPANs). 802.11 is for Wi-Fi (WLAN), 802.16 is for WiMAX (wireless broadband), and 802.3 is for Ethernet (wired). Bluetooth uses the 802.15.1 specification specifically.

NIC stands for Network Interface Card. It's the hardware component that connects a computer to a network. The other options misrepresent this standard acronym - Communication and Networking are not what the 'I' stands for.

FDDI stands for Fiber Distributed Data Interface, a standard for data transmission on fiber optic lines in a local area network (LAN). Option B is correct. It was developed by ANSI and supports data rates up to 100 Mbps. Option A has 'Data' and 'Distributed' in wrong positions. Option C incorrectly says 'Digital' instead of 'Data'. Option D has 'Digital' and misspells 'Distributed' as 'Ditributed'.

SONET is a standard for synchronous data transmission over optical fiber. The correct expansion is Synchronous Optical Networking (option D). Options A and B incorrectly use 'Service' or 'Simple', and option C incorrectly uses 'Optics' instead of 'Optical'.

SAN stands for Storage Area Network, which is a dedicated, high-speed network that provides block-level network access to storage devices.

In Informatica PowerCenter, lookup transformations are broadly classified into two main operational types: connected (integrated into the mapping pipeline) and unconnected (called from an expression).

IIS (Internet Information Services) stores log files in the W3SVC1 directory by default, where W3SVC1 represents the default website instance. The path C:\WINDOWS\system32\Logfiles\W3SVC1 is the standard location for the Default Web Site's logs. Options A and B are incomplete paths, while W8SVX10 is not a valid IIS website identifier.

Celerra is an EMC NAS (Network Attached Storage) product that supports file systems up to 16TB in size. This is a hardware specification limit for the Celerra platform. Option A (4TB) and B (8TB) are below the actual maximum, while D (32TB) exceeds it.

MQI (Message Queue Interface) is an API that applications use to interact with queues - it's not a channel at all. MQI calls are made by applications locally to the MQ client libraries, which then communicate over channels. The actual channels used for communication between Queue Managers are Message Channels (MCA channels), not MQI channels. MQI channels don't exist as a concept.

Message Channels in IBM MQ are unidirectional - they transfer messages in one direction only. A Sender channel sends messages from one Queue Manager to another, while a Receiver channel receives them. For bidirectional communication, you need two separate channels (a sender/receiver pair in each direction).

Transmission queues are specialized local queues in MQ that store messages destined for remote queue managers. Each remote queue definition can specify its own transmission queue, applications cannot directly access them, and their name conventionally matches the remote queue manager name.

Bursting is the feature that enables delivering a single report to multiple destinations simultaneously. Distributing typically refers to data distribution, broadcasting is one-to-many communication, and copying creates duplicates.

Flow control occurs at the transport layer (Layer 4), where mechanisms like TCP's sliding window prevent a fast sender from overwhelming a slow receiver. This ensures reliable data delivery. While the MAC sublayer has some flow control (e.g., Ethernet pause frames), the primary flow control is at the transport layer.