ist 201 final.txt

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Anonymous
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174427
Filename:
ist 201 final.txt
Updated:
2012-09-30 14:16:14
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ist 201
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Description:
ist 201 ch 2-6
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  1. Multiplexing
    segments from 2/+ msgs shuffling 2 share media
  2. Service
    provide response 2 request
  3. Process
    provide direction & movement of msgs, each occurrence in RAM <-- instance of running program, server SW
  4. Physical
    host addy is?
  5. Hubs/Switches/WAPs
    examples of Network Access Devices
  6. Encoding
    way data converted 2 energy patterns
  7. Interface
    allows Networks 2 communicate
  8. IEEE & IETF
    standardize protocols
  9. Transceivers
    on NICs 2 implement standards
  10. NITA
    protocol model acro
  11. APSTNDP
    reference model acro
  12. HW->best path->comm&ec->reps data
    NITA path
  13. Frame->Packet->Segment
    PDU path
  14. Port
    4 specific process/service
  15. Physical Layer responsibilities
    coding, compression, & encryption
  16. Session Layer responsibilities
    initiate, maintain, & restart
  17. RFC
    defines protocols
  18. Protocol
    rules a service uses
  19. daemon
    service that listens
  20. P2P
    no server/centralized resources
  21. Index Server
    P2P centralized directory
  22. DNS
    domain name 2 IP addy
  23. Resource Record
    on DNS
  24. DNS Resolver
    DNS client
  25. DNS Client
    is a service
  26. nslookup
    DNS cmd 2 list default server(s)
  27. named
    DNS daemon
  28. DNS Record Types
    A,NS,CNAME, & MX
  29. ipconfig/displaydns
    DNS cmd 2 list cached DNS entries
  30. DNS Hierarchy
    root->top level->secondary level
  31. HTTP Message Types
    GET,POST, & PUT
  32. SMTP
    from client 2 MDA & from MTA 2 MTA
  33. MUA
    mail client
  34. MDA
    mail server
  35. MTA
    between mail servers
  36. SMTP Commands
    HELO,EHLO,MAIL FROM, RCPT TO, & DATA
  37. DHCP Process
    DORA/N
  38. SMB
    sharing resources as if local
  39. Gnutella Packet Types
    ping, pong, query, query hit, & push
  40. VTY Session
    Telnet connection
  41. Telnet Commands
    AYT, EL, & IP
  42. end-to-end transfer
    Transport Layer responsibility
  43. Transport Layer
    flow control, segmentation/desegmentation, & error checking
  44. connection-oriented
    keeps track of segments & resends failures
  45. best-effort
    UDP
  46. UDP
    connectionless, RF768, 8 bytes overhead
  47. TCP
    connection-oriented, RFC793, 20 bytes overhead, performs sequencing
  48. socket
    port # + IP addy - xx.xx.xx.xx:#
  49. IANA
    assigns port #s
  50. well-known ports
    ports 4 services & apps (0-1023)
  51. registered ports
    ports 4 programs (1024-49151)
  52. dynamic/private ports
    ports 4 dynamic connection initiation, aka ephemeral (49,152-65,535)
  53. netstat
    command 2 list active TCP connections on host
  54. 3-way handshake
    SYN(100)-ACK(101)SYN(300)-ACK(301)
  55. TCP segment header fields
    URG, ACK, PSH, RST, SYN, FIN
  56. ISN
    Initial Sequence #
  57. windowing
    acknowledgment indicating next expected (expectational) byte #
  58. window size
    amount of data which can be sent b4 ACK required
  59. selective acknowledgments
    acknowledges non-contiguous segment bytes
  60. Network Layer
    addresses w/IP addy, encapsulation/decapsulation, routing
  61. Network Layer protocols
    IP, IPX, AppleTalk, CLNS (telecomm.)
  62. IPv4 characteristics
    connectionless, best-effort, & media-independent
  63. stack
    protocols working together, TCP/IP
  64. MTU
    Maximum Transmission Unit, max. size of a PDU on some networks
  65. fragmentation
    when smaller packet needed (is done by router)
  66. TTL
    max. hops packet travels b4 considered "lost"
  67. packet lengths
    min.=20 bytes, max=65,535 bytes, includes header
  68. 3 reasons 2 subnet
    geography, specific purpose, & ownership
  69. common network issues
    performance, security, & address management
  70. ipconfig
    cmd 2 check host IP addy, SM, & default gateway
  71. 3 features of routing tables
    destination network, next-hop, & metric
  72. metric
    2 decide between 2/> possible routes
  73. show ip route
    router cmd 2 show routing table
  74. netstat - r OR route print
    cmds 2 display host routing table
  75. 0.0.0.0
    default route, aka gateway of last resort
  76. routing protocols
    RIP, EIGRP, & OSPF ... have algorithms used by routers
  77. 8 bits
    = 1 byte
  78. high-order bits
    network portion of IP addy
  79. radix
    base # (2/10/16)
  80. directed broadcast
    2 all hosts on specific remote network
  81. limited broadcast
    regular, all 1s & all Fs
  82. multicast
    regular & 4 routers 2 xchange routing info.... 224.0.0.0 - 239.255.255.255
  83. reserved link local
    multicast groups on local network
  84. globally scoped
    multicast groups across Internet
  85. NTP
    2 synch network device clocks, 224.0.1.1
  86. prefix length
    # of network bits represented by slash 4mat
  87. private addresses
    10.0.0.0 - 10.255.255.255 , 172.16.0.0 - 172.31.255.255 , & 192.168.0.0 - 192.168.255.255
  88. NAT
    change private addresses 2 public 1s
  89. link local
    APIPA, 169.254.0.0 - 169.254.255.255
  90. IP class order
    A, B, C, D (MC), & E
  91. Class A
    0.0.0.0 - 127.0.0.0
  92. Class B
    128.0.0.0 - 191.255.0.0
  93. Class C
    192.0.0.0 - 223.255.255.0
  94. ARIN
    division of RIR, has IP addys
  95. 3 ISP tiers
    1 (connected 2 Internet backbone), 2 (business customers - servers), 3 (local/retail - small/med. businesses)
  96. 3 reasons network is subnetted
    2 overcome issues with: location, size, & control
  97. ping
    uses ICMP, reply = echo
  98. traceroute
    uses TTL & TE 2 limit hops incrementally
  99. ICMP
    used 4 messaging also, unreachable (H) / time xceeded (R) / redirection(R) / quench (source)
  100. IPv6
    128-bit

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