railway RRB JE (CBT I + CBT II) Mock Test 2024 Electronic Mechanic Computers Computer Hardware and Networking
Data-link layer of the OSI model specifies
1
Data link procedures that provide for the exchange of data via frames that can be sent and received
2
The interface between the X.25 network and packet mode device
3
The virtual circuit interface to packet-switched service
4
All of the above