NewWorking Chapter 2

a

QN=11 (8739) As soon as the browser receives the IP address from____, it can initiate a TCP connection to the HTTP server located at port_____ at that IP address a. DNS... 80 b. HTTP... 80 c. User...80 d. Client...60

a

QN=11 (8741) As soon as the browser receives the IP address from____, it can initiate a TCP connection to the HTTP server located at port_____ at that IP address a. DNS... 80 b. FTP... 20 and 21 c. User...80 d. Client...60

a

QN=11 (8743) Assume that the time it takes for a small packet to travel from the client to the server and then back to the client is 100 ms, then the round-trip time is a. 100ms b. 200ms c. 50ms d. 250ms

a

QN=11 (8744) HTTP, FTP, SMTP and POP3 run on top of... a. TCP b. UDP c. IMAP d. DNS

a

QN=12 (8746) While the____ significantly relies on always-on infrastructure servers, the____does not (or minimally relies on) a. Client-server model...Peer-to-Peer model b. Peer-to-Peer model ...Client-server model c. Client-server model...DNS d. DNS... Client-server model

a

QN=12 (8748) Which one is not belong to application layer? a. ARP b. HTTP c. DNS d. P2P

a

QN=12 (8753) The client-server model significantly relies on ____ infrastructure servers, the Peer-to-Peer model, instead, pairs of interminably connected peers, communicates ____ with each other a. Always-on....directly b. Always-off....indirectly c. Rarely-on...directly d. Rarely-off...directly

a

QN=12 (8754) The client-server model significantly relies on ____ infrastructure servers, the Peer-to-Peer model, instead, pairs of interminably connected peers, communicates ____ with each other a. Always-on....directly b. Always-off....indirectly c. Rarely-on...indirectly d. Rarely-off...indirectly

a

QN=13 (8760) An HTTP request message always contains _______. a. a request line and a header b. a header and a body c. a status line, a header, and a body d. a reply code

a

QN=13 (8761) Although HTTP is____, if the webserver wants to identify the users, ____is used a. Stateless...Cookies b. Stateless...Caches c. Heavy...Password d. Heavy...Cookies

a

QN=13 (8763) A Web page consists of _______ such as a HTML file, a JPEG image, a GIF image, a Java applet, an audio clip, etc. a. Objects b. Blocks c. Files d. Structures

a

QN=14 (8767) Because FTP uses a separate control connection different from data connection, FTP is said to sent its control information_____ a. Out-of-band b. Inside-band c. On-Bandwidth d. Different Band

a

QN=14 (8770) FTP uses port 21 for sending.... and port 20 for sending..... a. Identification and password.... Data file b. Data file... Identification and password c. Data file...Control signal d. Identification... Control signal

a

QN=14 (8771) FTP uses port____ for sending identification and password and port____ for sending data a. 21...20 b. 20...21 c. 20...80 d. 80..20

a

QN=15 (8776) Which one is correct about SMTP? a. SMTP restricts the body of all mail messages to be in simple seven-bit ASCII. b. SMTP is able to transfer attachment files c. SMTP transfers files faster than HTTP d. SMTP allows transferring multimedia files such as images, video...

a

QN=15 (8777) To talk with a mail server (with name serverName), we can use command a. telnet serverName 25 b. telnet serverName 80 c. telnet serverName 21 d. put serverName 21

a

QN=15 (8778) MIME is short for a. Multipurpose Internet Mail Extensions b. Multiple Internet Mail Extensions c. Message Internet Mail External d. Multipurpose Internet Message Extensions

a

QN=16 (8781) The______ that together implement the DNS distributed database, store____ for the hostname to IP address mappings. a. DNS servers....Resource Records b. Resource Records...DNS servers c. Root servers....IP address d. Root servers...IP address and port number

a

QN=16 (8782) The DNS servers that together implement the _____, store____ for the hostname to IP address mappings. a. DNS database ....Resource Records b. IP Records...DNS data c. Root servers....IP address d. Root servers...IP address and port number

a

QN=16 (8787) ____ are responsible for domains such as com, org, gov, and all of the country domains such as uk, fr, ca, and jp a. Top-level domain servers b. Root DNS servers c. Authoritative severs d. Country DNS servers

a

QN=16 (8789) Regarding to the DNS, IP addresses such as 209.191.122.70 or 10.22.8.8 are ____ to remember by human, but _____ to process by routers a. Difficult... Easy b. Easy...Difficult c. Easy...clear d. Difficult...heavy

a

QN=17 (8791) What type of DNS Server has the IP addresses of all names in the Autonomous? a. authoritative b. top level c. root d. local

a

QN=17 (8794) In DNS, TLD is short for a. Top-Level Domain b. Tier-1 Level Domain c. Time Lookup Domain d. Top Lookup Domain

a

QN=17 (8798) An ISP has a DNS server that holds both names of Web servers and their IP addresses. That DNS servers is called a. Authorative b. Centralized c. Distributed d. Cooperative

a

QN=18 (8802) Which one is correct about P2P network? a. A user computer can be both client and server b. A user computer is not allowed to change its IP address c. The must be a server containing all files for clients to download d. One user computer failure can lead to the whole P2P network to fail

a

QN=18 (8803) Which of the following is hybrid of client-server and P2P? a. Skype b. BitTorrent c. Telnet d. EBay

a

QN=18 (8806) The ability of P2P networks to handle many peers is called a. Scalability b. Multiplexing c. Multiple client-server model d. Self-controlled

a

QN=18 (8809) Skype is a a. None of them b. Transport Layer application c. Network Layer application d. Kazza application

d

QN=19 (8811) Assume the RTT 100ms, the size of the Web object 1kb and the transmission rate 100kbps, how long does it take to download that object from the Web Server to a client if using non-persistent HTTP? a. 220ms b. 110ms c. 410ms d. 210ms

a

QN=19 (8813) Assume the RTT 50ms, the size of the Web object 0.4Mb and the transmission rate 10Mbps, how long does it take to download that object from a Web Server to a client if using non-persistent HTTP?? a. 140ms b. 240ms c. 440ms d. 90ms

a

QN=19 (8814) Assume the RTT 40ms, the size of the Web object 0.2Mb and the transmission rate 20Mbps, how long does it take to download that object from a Web Server to a client if using non-persistent HTTP?? a. 90ms b. 50ms c. 170ms d. 60ms

a

QN=20 (8821) Which statement is correct about cookie technology? a. Most major commercial Web sites today use cookies b. None of them c. Web server does not has back-end database to record user's last activity d. User's browser has a back-end database to contain the web's content

a

QN=20 (8822) Which statement is correct about cookie technology? a. All of the others b. Cookie files are managed by the user's browser c. Webserver has a back-end database to store status of user's last activity d. Cookie files are kept on the user's end system

a

QN=20 (8826) Which one is INCORRECT about proxy? a. Proxy helps to remove the bottleneck of access link b. Proxy reduces the response time for a client request to a webserver c. Proxy reduces the traffic on the institution's access link to the Internet d. None of them

a

QN=20 (8828) Which one is incorrect about proxy? a. Client caches the whole website to improve the downloading speed b. Proxy reduces the response time for a client request to a webserver c. Proxy reduces the traffic on the institution's access link to the Internet d. Proxy can reduce the cost for ISP and the Institution

a

QN=23 (8833) IMAP is designed to allow users to manipulate______, so it is more_______ than POP3 a. Remote mailboxes.... Complex b. Local mailboxes...simple c. Local mailboxes....complex d. Remote mailboxes.... interesting

a

QN=24 (8840) Assume a website has only 5 different images, using non-persistent HTTP, a client needs ______ to the server a. 5 TCP connections b. 4 UDP connections c. 4 TCP connections d. 6 TCP connection

a

QN=53 (8829) POP3 is short for a. Post Office Protocol-Version 3 b. Popular Open Protocol-Level 3 c. Palm Open Protocol-Server 3 d. People Open Protocol-Version 3

a

QN=53 (8835) Three popular mail access protocols are a. POP3,IMAP and HTTP b. POP3, IMAP and HTML c. POP3, SMTP and HTTP d. PAN, SMTP, and HTTP

a

QN=54 (8839) Assume a webpage has only 10 different images, using non-persistent HTTP, a client needs ______ to the server to load. a. 10 different TCP connections b. 10 different UDP connections c. 11 different TCP connections d. Only 1 TCP connection

a

QN=54 (8842) Assume a website has only 15 different objects, using persistent HTTP, a client needs ______ to the server a. A single TCP connection b. 14 UDP connections c. 14 TCP connections d. Multiple TCP connections