Computer Networking
The CCITT Recommendation X.25 specifies three layers of communications:

datalink, network and transport
physical datalink and network
None of these
Session, transport and network
application, presentation and session

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Computer Networking
Why does the data communication industry use the layered OSI reference model?1. It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.2. It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.3. It supports the evolution of multiple competing standards and thus provides business opportunities for equipment manufacturers.4. It encourages industry standardization by defining what functions occur at each layer of the model.

1 only
3 only
2 and 3
1 and 4

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Computer Networking
Which is true regarding EIGRP successor routes?1. A successor route is used by EIGRP to forward traffic to a destination.2. Successor routes are saved in the topology table to be used if the primary route fails.3. Successor routes are flagged as "active" in the routing table.4. A successor route may be backed up by a feasible successor route.5. Successor routes are stored in the neighbor table following the discovery process.

3, 4 and 5
1 and 3
1 and 4
2 and 3

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