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66.
Which of the following IP addresses would not be valid for a DNS server on the Internet?
- A.10.25.11.33
- B.18.33.66.254
- C.155.118.63.11
- D.192.186.12.2
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| DNS servers resolve hostnames to IP addresses. On the Internet, a DNS server needs to have a public IP address. The address 10.25.11.33 is in a private address space, so that address would not be valid for a DNS server on the Internet. |
67.
The workstations on your network are configured to use a DHCP server. One of the
workstations can’t communicate with other computers. Its IP address is 169.254.1.18.
What could be the problem?
- A.The subnet mask is wrong.
- B.It has a private IP address.
- C.The default gateway is wrong.
- D.It can’t reach the DHCP server.
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| The address assigned to the computer is an APIPA address. Microsoft client computers (and others) will configure themselves with an address in this range if they are unable to reach a DHCP server. |
68.
Which of the following protocols is responsible for sending email?
- A.IMAP4
- B.POP3
- C.SMTP
- D.SNMP
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
69.
What port does the RDP protocol work on?
- A.53
- B.143
- C.389
- D.3389
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Remote Desktop Protocol (RDP) works on port 3389. DNS works on port 53, IMAP4 works on 143, and LDAP works on 389. |
70.
Which two TCP/IP protocols work at the Host-to-Host layer of the DOD model?
(Choose two.)
- A.IP
- B.ARP
- C.TCP
- D.UDP
- Answer & Explanation
- Report
Answer : [C, D]
Explanation :
Explanation :
| The two protocols that work at the Host-to-Host layer are TCP and UDP. IP and ARP both work at the Internet layer. |
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