CCNA Discovery 2: DsmbISP Chapter 7 Exam Answers v4.0

1. Refer to the exhibit. Which two statements are true about this file? (Choose two.)

  • If the gateway address changes, the file will be updated dynamically.
  • The command ping fileserv will use IP address
  • If the ping command is issued, the file will be checked for the Cisco web server IP address before DNS is queried.
  • The file must be created by the user if it is to be used by a workstation.
  • Name to IP address mappings are added to the file after they are received from DNS.

2. To meet customer expectations, an ISP must guarantee a level of service that is based on what two factors? (Choose two.)

  • accessibility
  • adaptability
  • availability
  • reliability
  • scalability

3. User1 is sending an e-mail to [email protected]. What are two characteristics of the process of sending this data? (Choose two.)

  • It utilizes TCP port 110.
  • A TCP connection is established directly between the User1 and User2 client computers  in order to send the e-mail message.
  • It utilizes a store and forward process.
  • The same application layer protocol is used to send the e-mail and retrieve it from the destination server.
  • SMTP is used to send the e-mail message to the mail servers.

4. Refer to the exhibit. Host1 is in the process of setting up a TCP session with Host2. Host1 has sent a SYN message to begin session establishment. What happens next?

  • Host1 sends an ACK message to Host2.
  • Host1 sends a SYN message to Host2.
  • Host1 sends a SYN-ACK message to Host2.
  • Host2 sends an ACK message to Host1.
  • Host2 sends a SYN message to Host1.
  • Host2 sends a SYN-ACK message to Host1.

5. What are three characteristics of network reliability? (Choose three.)

  • Redundant hardware provides enhanced reliability.
  • Reliability is measured as a percent.
  • Reliability is the responsibility of the ISP customers.
  • Fault tolerance is a measure of reliability.
  • The longer the MTBF, the greater the reliability.

6. Which two statements describe the FTP protocol? (Choose two.)

  • It uses well-known port 23.
  • The protocol interpreter is responsible for the data transfer function.
  • In passive data connections, the FTP client initiates the transfer of data.
  • It requires two connections between client and server.
  • FTP servers open a well-known port on the client machine.

7. What is the function of the TCP three-way handshake?

  • It enables the synchronization of port numbers between source and destination hosts.
  • It immediately triggers the retransmission of lost data.
  • It synchronizes both ends of a connection by allowing both sides to agree upon initial  sequence numbers.
  • It identifies the destination application on the receiving host.

8. What are three characteristics of HTTPS? (Choose three.)

  • It uses a different client request-server response process than HTTP uses.
  • It specifies additional rules for passing data between the application and data link layers.
  • It supports authentication.
  • It allows more simultaneous connections than HTTP allows.
  • It encrypts packets with SSL.
  • It requires additional server processing time.

9. Which DNS zone resolves an IP address to a qualified domain name?

  • dynamic lookup
  • forward lookup
  • resolution lookup
  • reverse lookup

10. What type of update allows client computers to register and update their resource records with a DNS server whenever changes occur?

  • dynamic
  • zone transfer
  • local recursive query
  • root domain query
  • top-level domain query

11. Which two statements are true about the OSI and TCP/IP models? (Choose two.)

  • The two bottom layers of the TCP/IP model make up the bottom layer of the OSI model.
  • The TCP/IP model is a theoretical model and the OSI model is based on actual protocols.
  • The OSI network layer is comparable to the Internet layer of the TCP/IP model.
  • The TCP/IP model specifies protocols for the physical network interconnection.
  • The TCP/IP model is based on four layers and the OSI model is based on seven layers.

12. Which two tasks are the responsibility of the local DNS server? (Choose two.)

  • maintaining a large number of cached DNS entries
  • maintaining the ISP server
  • mapping name-to-IP addresses for internal hosts
  • forwarding name resolution requests to a caching-only server
  • forwarding all name resolution requests to root servers on the Internet

13. What are three unique characteristics of UDP? (Choose three.)

  • connection oriented
  • full-duplex operation
  • low overhead
  • no flow control
  • no error-recovery function
  • reliable transmission

14. A manufacturing company is looking into subscribing to services from a new ISP. The company requires hosted world wide web, file transfer, and e-mail services. Which three protocols represent the key application services that are required by the company? (Choose three.)

  • FTP
  • HTTP
  • ICMP
  • PPP
  • Telnet
  • SMTP

15. Which two options correctly match protocol and well-known port number? (Choose two.)

  • DNS – 25
  • FTP – 110
  • HTTP – 80
  • POP3 – 25
  • SMTP – 25

16. Within TCP, what combination makes up a socket pair?

  • source port with destination port
  • source IP address with destination port
  • source IP address and destination IP address
  • source IP address and port with a destination IP address and port

17. Which protocol is used to send e-mail, either from a client to a server or from a server to another server?

  • SNMP
  • FTP
  • SMTP

18. Refer to the exhibit. The PC is requesting HTTP data from the server. What is a valid representation of source and destination sockets for this request?

  • Source – ; Destination –
  • Source – ; Destination –
  • Source – ; Destination –
  • Source – ; Destination –

19. What type of DNS server is typically maintained by an ISP?

  • caching-only
  • root
  • second-level
  • top-level

20. A client is communicating with a server on a different segment of the network. How does the server determine what service is being requested by the client?

  • The server will apply the default service configured in directory services.
  • The server will use ARP to discover the appropriate service from the local router.
  • The server will send a request to the client asking for the appropriate service.
  • The server will determine the appropriate service from the destination port field.

21. When a host is communicating with multiple applications on the same server at the same time, which of the following will have the same value for each session? (Choose two.)

  • IP address
  • MAC address
  • session number
  • sequence number
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