CS 441, Fall 2002                                  Information about Test 1
---------------------------------------------------------------------------

The first of two tests in this course takes place in class on Friday,
October 18.  It covers material from Chapters 1 through 3 in the text,
plus labs, assignments, and the handout on protocols that consisted of
the one-page descriptions prepared by students as homework.  In Chapter 1,
we covered only Sections 1, 2, 3, 7, and 8.  In Chapter 2, you are
not responsible for programming with sockets in Java.  We did not cover
all the detailed mathematical analyses given in the text.  Here is a 
list of topics that might be covered on the test.

  protocol                                ping
  network edge vs. network core           traceroute
  hosts                                   telnet as universal TCP client
  LAN (local area network)                daemon
  internet                                socket programming 
  routers                                 ServerSocket class:
  packets                                    ServerSocket(port),
  layered network protocols                  accept(),
  application layer                          close()
  transport layer                         Socket class:
  network layer                              Socket(name,port),
  link layer                                 send(),
  physical layer                             sendBinary(),
  PDU                                        receive(),
  segment, datagram, frame                   receiveBinary(),
  protocol headers                           close()
  IP address                              try..catch statement
  port                                    client/server programming
  unreliable, connectionless service      
  packet loss                             basic facts about:
  client/server                               NNTP   
  sockets and server sockets                  NFS    
  listening on a port                         IRC    
  UDP and streaming media                     NTP    
  HTTP: Web servers and Web browsers          DHCP   
        HTTP versions                         SSH    
        URL                                   NIS    
        HTTP request / HTTP response          RSYNC  
        GET request                           SNMP   
        headers                               LDAP   
        status line
        stateless protocol        
        cookies
        conditional GET
        Web cache
  FTP: control connection (port 21)
       data connection (port 20)
       ASCII vs. binary files
       "put" and "get" commands
  mail:  SMTP
         mail servers
         message headers
         MIME types / non-text data
         mail access protocols
         POP3 and IMAP
  DNS: IP addresses vs. host names
       host name lookup
       DNS query
       distributed database
       root name servers
       authoritative name server
       MX record
       DNS caching
  port numbers (0 through 65535)
  reserved port numbers
  checksum
  source port / destination port
  source IP / destination IP
  why use UDP?  why use TCP?
  UDP: connectionless
       unreliable
       no flow control
       no congestion control
  TCP: connection-oriented
       bidirectional
       reliable
       streams, not messages
       cumulative ACKs
       sequence numbers
       acknowledgment numbers
       transmission window
       sliding-window protocol
       send and receive buffers
       flags: SYN, ACK, FIN
       three-way handshake
       connection setup
       SYN packets
       closing a connection
       FIN packets
       retransmission of packets
       retransmission timeout
       duplicate packets
       flow control
       receive window
       round-trip time (RTT)
       setting the retransmission timeout
       exponentially weighted moving average
       estimating the RTT
       estimating the variation in RTT
       congestion control
       buffer overflow
       packet queue in a router
       queuing delay
       congestion window
       threshold
       slow start
       managing congestion window size