ITPEC IP October 2021 Question 30
When another network such as the Internet is accessed from a network in an office or a household, which of the following fulfills the role of an entrance or an exit to the other network?
Explanation
Default gateway — the device that acts as the entrance and exit between the local network and other networks.
When a PC sends a packet to an address outside its own network, it hands the packet to the default gateway, normally the router of the LAN, which forwards it toward the Internet. Replies from outside come back into the LAN through the same device.
Answer (b)
Why not others:
- •(a) Splitter — separates or combines signals on a line (for example voice and data on ADSL), it does not route between networks
- •(c) Hub — connects devices within the same LAN and relays frames among them
- •(d) Repeater — amplifies and regenerates a signal to extend cable length within one network
Key rule: Traffic for another network goes through the default gateway; hubs and repeaters only work inside one LAN.
Networks · AI-written, may contain errors
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