CNIT 344 Exam 2
OSI Layers - Answer-1. Physical
2. Data Link
3. Network
4. Transport
5. Session
6. Presentation
7. Application
Layer 3 Provides_________________________ - Answer-globally unique addressing for every node in the network
What does layer 3 convert? - Answer-Data to Packe...
CNIT 344 Exam 2
OSI Layers - Answer-1. Physical
2. Data Link
3. Network
4. Transport
5. Session
6. Presentation
7. Application
Layer 3 Provides_________________________ - Answer-globally unique
addressing for every node in the network
What does layer 3 convert? - Answer-Data to Packets
Routable Protocols of Layer 3 - Answer-IP, IPX, AppleTalk
Layer 3 determines_____________________ - Answer-routes between source and
destination networks (end-to-end with analysis at each hop)
Is Layer 3 reliable? - Answer-NO
What does Layer 4 convert? - Answer-Data to Messages or Segments
What is Layer 4 responsible for? - Answer-Host-to-Host integrity of transmission, it
does this by detecting damaged or lost packets and generates re-transmit requests
and re-sequences packets
Layer 4: Stop and Wait - Answer-forces sender to wait for acknowledgement and
error control is achieved by discarding corrupted packets and letting the sender
resend unacknowledged packets when the timer expires (calculations done in mod
2)
Layer 4: Go-Back-N - Answer-defines the expected order of packets
What do VLANs do? - Answer-Enable multiple LANs on a switch
Do Layer 2 switches forward traffic between VLANs? - Answer-NO
Each VLAN is a separate _______ domain. - Answer-Broadcast
Each VLAN is a separate_____________ - Answer-IP Subnet, you need a router to
communicate among these
Types of VLANs - Answer-Data, Default, Native, Management, Voice
How is VLAN membership assigned? - Answer-By port, MAC address, Network
protocols, IP subnets (L3), higher layer protocols
, What is a Trunk? - Answer-A physical AND logical connection, it doesn't belong to
any specific VLAN, and is a conduit between switches & routers and switches &
switches
What does Tagging do? - Answer-Identifies each frame that is transferred over the
trunk
What happens to untagged frames? - Answer-They are dropped
Tagged - Answer-An Ethernet frame that is addressed to a specific VLAN
Why is IP unreliable? - Answer-IP does not have the capability to manage and
recover from undelivered/corrupt packets (but since Layer 4 deals with this it can
function efficiently and unreliably at Layer 3)
What does media independent mean? - Answer-Not concerned with physical media
(IP IS concerned with Max Transmission Unit though)
2 Level Hierarchy of IP Addresses - Answer-Network & Host (hierarchy means that
routers only need to know the "network" part)
Address Types - Answer-MAC: physical address of host that is burned into the NIC
(Layer2)
NET: logical, assigned by the network admin (Layer3)
What is a Default Gateway? - Answer-The IP address of the router, defined to all
hosts on the network
Can a packet be forwarded without a route? - Answer-NO
IP CLASSES - Answer-Class A range: 1-126
subnet mask: 255.0.0.0.
Private: 10.x.x.x
Class B range: 128-191
subnet mask: 255.0.0.0.
Private: 172.16.0.0 - 172.31.255.255
Class C range: 192-223
subnet mask: 255.255.255.0
Private: 192.168.x.x
Loopback is 127.0.0.1
APIPA is 169.254.x.x (also known as link-local)
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