Network Models

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Author:
gbird
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187555
Filename:
Network Models
Updated:
2012-12-06 12:31:59
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Network Models
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Network Models
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  1. Name of sections of the Cisco Hierarchical Model (3-Layer Model)
    • Core
    • Distribution
    • Access
  2. What is an important feature of the Core area of the 3-Layer Model?
    Speed
  3. What devices are found in the Core section of the 3-Layer Model?
    Big fast switches, and servers
  4. Is Routing and packet filtering done at the Core area of the 3-Layer Model?
    No
  5. Is QoS done at the core area of the 3-Layer Model?
    Sometimes
  6. Is Routing and Packet filtering done at the distribution area of the 3-Layer Model?
    Yes
  7. What area of the 3 layer model does the WAN or Internet connection come to?
    Distribution
  8. What area of the 3-Layer Model is QoS handled?
    Distribution
  9. What is the purpose of the distribution Layer of the 3-Layer Model?
    Route traffic to other networks
  10. What devices are found at the distribution layer of the 3-Layer model?
    Routers and Layer 3 switches
  11. How is Packet Filtering managed at the distribution layer of the 3-Layer Model?
    Access Control Lists
  12. At what layer of the 3-Layer Model is the translation between different LAN technologies (TokenRing, Fiber- Distributed Data Interchange, and Ethernet) is done?
    Distribution
  13. What Layer of the 3-Layer Model is broadcast domain segmentation controled?
    Distribution
  14. At What layer of the 3-Layer Model Connects the end users to the network (hubs, switches, WAP, remote office connection, dial-up service, VPN)
    Access
  15. What Network Model was developed by ISO?
    OSI
  16. What does ISO stand for?
    InternationalStandards Organization
  17. What is the purpose of the OSI model?
    to allow inter operability between different manufacturers
  18. Name the 7 Layers of the OSI model starting with Layer 7.
    • 7.  Application
    • 6.  Presentation
    • 5.  Session
    • 4.  Transport
    • 3.  Network
    • 2.  Data Link
    • 1.  Physical
  19. Name the 6 protocols found at the application layer of the OSI model.
    FTP, SMTP, POP3, NTP, SNMP, TFTP
  20. What is the purpose of FTP and what does it stand for?
    Reliably send/retrives all file types, File Transfer Protocol
  21. What is the purpose of SMTP and what does it stand for?
    Sends mail, Simple Mail Transfer Protocol
  22. What does POP3 stand for and what is it?
    Post Office Protocol version 3, Retreives email
  23. What does NTP stand for and what is it?
    Network Time Protocol, Syncronizes Networked device Clocks
  24. What does SNMP stand for and what is it?
    Simple Network Mangment Protocol, Communicates status and allows control of network devices
  25. What does TFTP stand for and what is it?
    Trivial File Transfer Protocol, simple lightweight file transfer
  26. What is the purpose of the presentation Layer of the OSI Model?
    Marks the application layer with formatting codes and provides some encryption
  27. What is the purpose of the session layer of the OSI model?
    Initiates and terminates network connections
  28. What are the 2 types of connections found at the transport layer of the OSI Model?
    • Connection Oriented
    • Connectionless
  29. Is the connectionless connection at the transport layer of the OSI model reliable?
    no
  30. Which is connection type of the OSI model faster, Connection oriented or connectionless?
    Connectionless
  31. Which layer of the OSI model uses UDP, Connection oriented or connectionless?
    connectionless
  32. Which layer of the OSI model uses TCP, Connection oriented or connectionless?
    connection oriented
  33. Is the connection oriented connection at the transport layer of the OSI model reliable?
    yes
  34. What is the 3 step process called that the transport layer uses to establish a reliable communication using TCP?
    three way handshake
  35. The aknowledgment that the receiver sends back to the sender of the three-way handshake, what is this called and what does it stand for?
    PAR (Positive acknowledgment and Retransmission)
  36. During the transmition of data, which layer managed flow control?
    Transport Layer
  37. When the transport layer adjusts the speed of data to the sender when it is to fast, what is this called?
    Sliding window
  38. What ports do FTP use and is it TCP or UDP?
    20 and 21, TCP
  39. What ports do telnet use and is it TCP or UDP?
    23, TCP
  40. What ports do SMTP use and is it TCP or UDP?
    25, TCP
  41. What ports do HTTP use and is it TCP or UDP?
    80, TCP
  42. What ports do POP use and is it TCP or UDP?
    110, TCP
  43. What ports do NNTP use and is it TCP or UDP?
    119 TCP
  44. What does NNTP stand for and what is it?
    Network News Transfer Protocol, carries copies of Usenet messages from computer to computer
  45. What is Usenet?
    Usenet is the set of people who exchange articles tagged with one or moreuniversally-recognized labels, called "newsgroups" (or "groups" for short).
  46. What ports do HTTPS use and is it TCP or UDP?
    443 TCP
  47. What ports do DNS use and is it TCP or UDP?
    53 UDP
  48. What ports do DHCP use and is it TCP or UDP?
    67 and 68, UDP
  49. What ports do TFTP use and is it TCP or UDP?
    69 UDP
  50. What ports do NTP use and is it TCP or UDP?
    123, UDP
  51. What ports do SNMP use and is it TCP or UDP?
    161, UDP
  52. What is the range of ports for ports known as well-known ports?
    0-1023
  53. What is the range of ports for ports known as registered ports?
    1024– 94151
  54. What is the range of ports for ports known as Dynamic/Private ports?
    49152– 65535
  55. What is the term for multiple ports used during a single connection?
    Multiplex connection
  56. Name the different parts of a TCP Header
    Source Port, Destination Port, Sequence Number, Acknowledgment number, Misc. flags, Window Size, Check Sum, Urgent, Options
  57. Once the TCP header is attached the the data, what is it now called?
    Segment
  58. Name the parts of a UDP header.
    Source Port, Destination Port, Legnth, Checksum
  59. At what layer of the OSI model is logical addressing handled?
    Network
  60. At what layer of the OSI model is path determination made?
    Network
  61. What are the layer 3 protocols of the OSI model?
    IP, IPX, ICMP, OSPF, IGRP, EIGRP, RIP, ISIS, ARP, RARP
  62. Describe the IP protocol for the network layer of the OSI model.
    IP is the mother protocol of TCP/IP, featuring routable 32-bit addressing.
  63. Describe the IPX protocol for the network layer of the OSI model.
    equivalant of the IP in Novell Netware
  64. What is the purpose of the following Protocols, OSPF, IGRP, EIGRP, RIP, ISIS
    Dynamic Routing Protocols that learn about remote networks and the best paths to them from other routers running the same protocol.
  65. What is the purpose of ARP and RARP
    Address Resolution Protocol (and Reverse ARP), ARP learns what MAC address is associated with a given IP address.  Reverse ARP learns an IP address of a given MAC address.
  66. What protocols are found at layer 2 of the OSI model?
    Ethernet, Frame Relay, point to point (PPP), High-Level Data Link Control Protocol (HDLC), Cisco Discovery Protocol (CDP)
  67. How many digits are in a MAC address?
    12
  68. What are the first 6 characters of a MAC address called and what is the purpose?
    OUI (Organizational unique identifier)  This identifier is used to identify the company who made the card
  69. What are the last 6 digits in a MAC address used for
    This is th cards serial number
  70. How does a host learn the MAC address of a particular IP?
    a host will broadcast an ARP request to find out the MAC address of a particular IP
  71. What does Frame Relay use for Unique Host Identifiers?
    DLCI (Data Link Connection Identifiers)
  72. What does a dial-up link use for Unique Host Identifiers?
    A dial-up link using regular analog phone or digitalISDN will use the phone number as the Layer 2 address of the IP you are tryingto reach.
  73. What network devices are found at layer 2 of the OSI model?
    switches and bridges
  74. How do layer 2 network devices treat data packages?
    they read MAC addresses in frames and forward them to the appropriate link.
  75. What layer of the OSI model contains an error-checking calculation called the FCS(Frame Check Sequence).
    Layer 2
  76. What is the error checking method that is used with Layer 2 network devices?
    FCS (Frame Check Sequence).
  77. What is the Physical layer of the OSI model?
    This is the layer that constists of the physical pathway from one device to another.
  78. describe the encapsulation process from one layer to the next of the OSI model starting with Layer 7
    • 1.  Application data is passed to the presentation layer.
    • 2.  The application and presentation data is passed down to the session layer.
    • 3.  The application, presentation and session data is handed down to the transport layer which makes a segment.
    • 4.  The segment is handed down to the network layer which makes a packet.
    • 5.  The packet is handed down to the data link layer which makes a frame.
    • 6.  The Frame is handed down to the physical layer.
    • 7.  The Physical layer breaks the frame down to bits to transmit accress the network. 
  79. WHat are the OSI PDUs?  What does PDU stand for?
    • Data, Segment, Packet, Frame, Bit
    • protocol data unit
  80. What are the four layers of the TCP/IP model?
    • Application
    • Transport
    • Internet
    • Network Interface
  81. What layers of the OSI model correspond with the application layer of the TCP/IP Model
    Application, Presentation, session
  82. What layers of the OSI model correspond with the transport layer of the TCP/IP Model
    Transport
  83. What layers of the OSI model correspond with the internet layer of the TCP/IP Model
    Network
  84. What layers of the OSI model correspond with the network interface layer of the TCP/IP Model
    Data Link and Physical

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