Computer Networks

Routers operate at Layer 3 (Network Layer) and make forwarding decisions based on IP network addresses and network classes (Class A, B, C), not individual MAC addresses. They route packets between different networks. Bridges and switches work at Layer 2 using MAC addresses, while hubs simply repeat signals to all ports without any decision-making capability. Only routers use network address groups for routing decisions.

A switch operates at Layer 2 and learns MAC addresses to forward frames only to specific destination ports, unlike a hub which broadcasts to all ports. This provides dedicated bandwidth to each connected device, making data transmission more efficient. Switches are the core devices providing concentrated connectivity in modern networks.

Infrastructure applications provide foundational services that support organizational operations. VPNs enable secure remote connectivity, System/Network Management tools monitor and maintain IT health, email services handle communication, and office software suites support productivity. All represent infrastructure-layer applications that multiple users or systems depend on.

With 20% overhead, effective bandwidth is 8 Mbps. Converting 1 GB to megabits: 1 GB = 8,192 Mb. At 8 Mbps, time = 8,192 / 8 = 1,024 seconds ≈ 17 minutes. Option C (15 minutes) is the closest approximation.

Network bandwidth measures the data transfer capacity per unit time, which is a throughput metric. Response time measures latency, not throughput. 'Number in the system' is a queue metric. 'Utilization' measures how much of capacity is used, not the capacity itself.

A single switch has ONE broadcast domain - all ports are in the same broadcast domain by default. Broadcast frames (like ARP requests) are flooded out all ports except the receiving port. To create multiple broadcast domains, you need VLANs or separate switches connected via a router.

By default, all ports on a switch belong to a single broadcast domain. Broadcast frames are forwarded out all ports except the originating port. VLANs can create multiple broadcast domains, but a basic switch has one.

By default, all ports on a switch belong to a single broadcast domain. Broadcast frames are forwarded out all ports except the originating port. VLANs can create multiple broadcast domains, but a basic switch has one.

A basic switch (without VLANs) has exactly ONE broadcast domain. All ports on a switch belong to the same broadcast domain, meaning broadcast frames are flooded to all ports. This is different from collision domains where each switch port is a separate collision domain. Broadcast domains can be segmented using VLANs, but a default single-switch configuration has one broadcast domain.

In Informatica PowerCenter, a Router is an active transformation because it can change the number of rows that pass through it (e.g., dropping rows that do not match any group condition). Passive transformations must preserve the row count and row identity.

Piggybacking refers to using someone else's wireless Internet connection without their permission. It's the correct term for this unauthorized access to Wi-Fi networks.

On a home/single system with no network, Map Network Drive has nothing to connect to. The tool requires network infrastructure - either domain/workgroup membership or direct network path access. Without these, clicking the menu option does nothing because there are no network resources to map.

A Wide Area Network (WAN) connects networks over large distances, typically using high-speed telephone lines or leased lines. LANs cover small areas like buildings, URL is an address format, and World Wide Web is a service that runs over networks.

In Pega PRPC, Utility shapes support multiple connector types: Always (unconditional execution), When (conditional based on criteria), Status (based on flow status codes), and Else (fallback when no When conditions match). All four types can emanate from a Utility shape.

In Oracle Data Integrator (ODI), physical connections, physical schemas, and data servers are defined and managed within the Topology Manager. Security manager handles users, and Designer handles projects and mappings.