Computer Networking
Which type of OSPF network will elect a backup designated router?1. Broadcast multi-access2. Non-broadcast multi-access3. Point-to-point4. Broadcast multipoint

3 only
3 and 4
None of these
1 and 2

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Computer Networking
The physical layer, in reference to the OSI model, defines

the interface between the X.25 network and packet mode device
data link procedures that provide for the exchange of data via frames that can be sent and received
None of these
All of these
the virtual circuit interface to packet-switched service

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