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7 Written questions

6 Multiple choice questions

  1. - needs to establish an end to end path before transmission.
    - analogue networks.
    - ISDN
    - PPP
  2. - operates in different frequency range - 5 GHZ.
    - less prone to interference.
    - greater speeds.
    - not as widely used.
  3. - Similar to bridge in that it routes frames.
    - most commonly used to connect individual computers.
  4. - based on EAP framework; negotiate authentication method at startup.
    - 802.1X standard.
    - uses AES
  5. transform raw transmission facility into a line that appears free of undetected errors to the network layer.
    Accomplishes this by having the sender break up the input into frames, and transmit them sequentially. If the service is reliable, the receiver confirms the correct receipt of each frame.
  6. data link layer does not understand IP addresses.
    ARP sends out request, who owns IP address? this is used to build table of MAC 48 bit addresses to IP addresses.
    - defined in RFC 826.
    - vulnerable to ARP poisening ( adding bogus entries to ARP cache).

6 True/False questions

  1. 802.11g- backwards compatible with 802.11b so same WAP can service 802.11g and 802.11b.


  2. Unicast- associated with point-to-point networks.
    - point to point transmission with one sender and one receiver.


  3. Blue tooth- available in a range of mobile devices.
    - operates in both ad-hoc mode and infrastructure mode.
    - by default security is disabled but does have three security modes, ranging from full data encryption to integrity control.
    - only authenticates devices, not users.
    - vulnerable to buffer over flow.


  4. Broadcasttransmission of frames to a subset of the machines on the broadcast network.


  5. SSID- straight out of the box, no security configured at all.
    - WAPs are usually configured to broadcast their presence.
    - each wireless network node and access point needs the same SSID.
    - could choose not to broadcast SSID.
    - Also could implement MAC filtering.


  6. bridgesconnects two or more LANs.
    When a frame arrives, software in the bridge extracts the frame header and looks it up in a table to see where to send the frame.
    - different line cards for different technologies, Ethernet, FDDI etc.
    - each line has its own collision domain.


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