Which of the following statements best describes a hub?
Answer : B
A hub is a physical layer (Layer 1) networking device used to connect multiple Ethernet devices in a network. Unlike switches or routers, hubs do not inspect or process frame headers. Instead, they perform a simple task:
Receive a signal (electrical or optical) on one port
Replicate that signal identically to all other ports
This means the hub does not examine Layer 2 (MAC addresses) or Layer 3 (IP addresses) and does not perform intelligent forwarding. It merely broadcasts all incoming traffic to every other connected device, often resulting in high collision domains and poor efficiency.
Option A describes a repeater, not a hub.
Option C describes a switch (Layer 2 device).
Option D describes a router (Layer 3 device).
Option B is correct: A hub does not inspect headers and replicates traffic blindly.
Nokia IP Networking Fundamentals Study Guide -- Chapter: 'Network Devices and OSI Model'
Which of the following statements about MD-CLI is FALSE?
A. It allows atomic transactions.
B. Configuration changes are activated when the running configuration datastore is saved to a file.
C. To achieve transactional configuration, it is necessary to have multiple configuration datastores.
D. Multiple users may enter the global configuration mode concurrently.
Answer : B
The Model-Driven Command Line Interface (MD-CLI) in Nokia SR OS provides a structured and programmatic way to manage configurations. It is based on a transactional model, meaning changes are made in a candidate configuration before being committed to the running configuration.
Let's review each statement:
Nokia SR OS MD-CLI User Guide
Nokia SRA Study Guide -- Chapter: 'Model-Driven Configuration and Transactions'
Which compact flash on a control processing module (CPM) of a Nokia 7750 SR stores the runtime software image and the configuration file?
Answer : C
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