Google IT Support Professional:The Bits and Bytes of Computer Networking (Week 4) Networking Services.
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★Name Resolution★
Q1.What transport layer protocol does DNS normally use?
- TCP
- IP
- ICMP
- UDP
While DNS over TCP does exist, UDP is the most common protocol.
Q2.A DNS TTL determines what?
- How many steps there are in the resolution process
- How far away a DNS can be from you
- How many DNS resolutions can take place before the IP has to change
- How long a DNS entry is allowed to be cached
TTL stands for Time to Live and determines how long a DNS entry can be cached.
Q3.How many root servers are there?
- 8
- 13
- 16
- 17
There are 13 root servers.
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