CPSC 353 Ch2
Compressed Internet video typically ranges from ___ kbps for low-quality video to 3 Mbps for streaming high-definition movies
100 3
The standard port for connecting to an SMTP server is
25
The number or root name servers in the world is about
400
An HTTP response message does NOT include
A response line
Protocols that use the peer-to-peer paradigm
BitTorrent and Skype
Which of the following is not listed as one of the three classes of DNS servers (Authoritative DNS servers, Caching DNS servers, Top Level domain servers, Root DNS servers)
Caching DNS servers
One of the most compelling features of client-server architectures is their self-scalability
False
The TCP protocol provides timing guarantees
False
The Web typically sends multiple objects in a Web page within a multipart MIME message.
False
The main purpose of DNS is to translate IP address into host names
False
The first message from an SMTP client to an SMTP server starts with _____
HELO
Protocols that use the client-server paradigm
HTTP (HyperText Transfer Protocol), FTP (File Transfer Protocol)
A registrar, a commercial entity accredited by ________, verifies the uniqueness of a domain name request and enters the domain into the DNS database.
ICANN
____ is more efficient over a low-bandwidth connection
IMAP
To close an SMTP session, the client will send the message ____ to the server
QUIT
Which of these is not a mail access protocol (POP3, IMAP, SMTP, HTTP)
SMTP
HTTP uses the services of _________.
TCP
The collection of all BitTorrent peers participating in the distribution of a particular file is called a
Torrent
When a peer joins a torrent, it registers itself with an infrastructure node called a ___________ and periodically informs this node that it is still in the torrent.
Tracker
A Web cache, or proxy server, is a network entity that satisfies HTTP requests on behalf of an origin Web server
True
An HTTP server maintains no information about its clients
True
DNS can use a combination of Iterative Queries and Recursive Queries
True
HTTP can use both persistent and nob-persistent connections
True
SMTP restricts the body of all mail messages to simple 7-bit ASCII
True
The DNS is a distributed database implemented in a hierarchy of DNS servers
True
The DNS is an application layer protocol that allows host to query the distributed database
True
The DNS servers are often UNIX machines running the Berkeley Internet Domain (BIND) software
True
This distribution time in a P2P network is the amount of time it takes to get a copy of the file to all N peers
True
The "com" Top Level Domain servers are maintained by
Verisign
A browser will generate header lines as a function of
browser type and version, user configuration of browser, whether the browser has a cached version of the requested object
Peers in a torrent download equal-size pieces of a file called
chunks
The HTTP protocol is stateless, but a web server can identify users by using
cookies
The unchoked peers are the ________ peers from which a BitTorrent client is receiving data at the highest rate.
four
When an SMTP connection is established, the first message is passed
from the server to client
With DASH, different video versions, with different bit rates and quality, are stored on the HTTP server, each with a different URL. The HTTP server also has a __________ file which provides a URL for each version along with its bit rate.
manifest
The ____ record permit's a company's mail server and Web server to have identical (aliased) hostnames
mx
In a ___________ connection, one TCP connection is made for each request/response.
nonpersistent
The first section of a URL identifier is the __________.
protocol
SMTP is primarily a ____ protocol
push
In __________ resolution, the resolver expects the server to supply the final answer.
recursive
A process sends messages into, and receives messages from, the network through a software interface called a
socket
In a client-server paradigm
the server must be running all the time but the client needs to be running only when it is needed
DNS lookups often involve a combination of recursive and iterative queries.
true
The components of the Internet mail system includes
user agents, mail servers, the Simple Mail Transfer Protocol
