Google IT Support Professional:The Bits and Bytes of Computer Networking (Week 2) The Network Layer.

 

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★The Network Layer★

Q1.Please select all of the valid IP addresses. Check all that apply.

1. 123.456.123.456
2. 192.168.1.1
3. 8.8.8.8
4. 257.70.312.49

Q2.What happens to the TTL field of an IP datagram every time it reaches a router?

1. The TTL field is decremented by one.
2. The TTL field is reset to zero.
3. The TTL field is used for a cyclical redundancy check.
4. The TTL field is incremented by one.

At every router hop, the TTL field is decremented by one until it reaches zero, causing the datagram to be discarded.

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