1. Which layer of the four-layer TCP/IP model encapsulates datagrams for transmission on physical media?
a. application
b. Internet
c. network access 
d. transport

2. Which three application-layer protocols use UDP as the transport protocol? (Choose three.)
a. DNS 
b. ICMP
c. HTTP
d. SNMP 
e. TFTP 
f. SMTP

3. Within DNS, what domain level does the example www.cisco.com represent?
a. Sub domain
b. Top level domain
c. Second level domain
d. Fully qualified domain name

4. Which two protocols define how an e-mail client retrieves mail from the server? (Choose two.)
a. FTP
b. HTTP
c. IMAP 
d. POP3 
e. SMTP
f. Telnet

5. An e-mail client connection downloads all messages and then deletes them from the e-mail server. Which type of client connection does this by default?
a. IMAP
b. POP1
c. POP3 
d. SMTP

6. Within FTP, which connection type closes automatically when the file transfer is complete?
a. UDP session
b. control stream
c. protocol interpreter
d. data transfer process 

7. An IP packet arrives at a server addressed to TCP port 21. Which application-layer service is the destination of the packet?
a. HTTP
b. HTTPS
c. FTP
d. IMAP
e. POP3

8. What DNS zone resolves fully qualified domain names to IP addresses using a local DNS server?
a. dynamic lookup
b. forward lookup 
c. resource record
d. reverse lookup

9. What are two common DNS lookup methods? (Choose two.)
a. using ISP-caching DNS servers 
b. configuring a HOST file on each computer
c. statically assigning DNS information to hosts
d. using a DNS server located on company premises 
e. having a company-registered top-level domain (TLD)

10. Match the characteristic on the top to the protocol it describes (TCP or UDP).
* guaranteed delivery
* does not require acknowledgments
* breaks data into segments
* retransmits lost data
* connectionless
* unreliable

11. Employees of a small auto repair company frequently access the same automobile parts supplier website to find videos that show how to install a new part. Often three or four employees are viewing the same video file or graphic from different PCs.  What service can the ISP provide to the auto repair company to improve the response for this application, as well as other Internet applications?
a. a local DNS server
b. a HTTPS server
c. a proxy server 
d. a video streaming server

12. Why is it important for the source and destination hosts to synchronize sequence numbers during the TCP three-way handshake? (Choose two.)
a. to enable the host to identify which application is the destination of the segments
b. so both hosts can keep track of the segments sent and acknowleged 
c. to create a socket pair for communicating between the hosts
d. to provide destination information to the network devices in the path
e. to identify lost segments that must be retransmitted 
f. to indicate when the IP address of the host has been translated