Ethernet Chap 5 Flashcards
Which sublayer does ethernet 802.2 operate at?
logical link control LLC
Which sublayer does ethernet 802.3 operate at?
MAC sublayer
Which ethernet sublayer controls the network interface card through software drivers?
LLC
Which ethernet sublayer works with the upper layers to add application information for delivery of data to higher level protocols?
LLC
Which ethernet sublayer works with hardware to support bandwidth requirements-checks for errors in bits sent and received
MAC
Which ethernet sublayer controls access to the media through signaling and physical media standards requirements?
MAC
Which ethernet sublayer support ethernet technology by using CSMA/CD or CSMA/CA?
MAC
Which ethernet sublayer remains relatively independent of physical equipment?
LLC
What are the 2 major responsibilities of the Ethernet MAC sublayer?
data encapsulation and media access control
3 primary functions of Ethernet data encapsulation
- Frame delimiting 2. Addressing 3. Error detection
2 primary functions of media access control
- control of frame placement on and of the media
2. media recovery
media access control method that does require mechanisms for tracking whose turn it is to access the media
contention based
how many bits are there in an ethernet mac address?
48 bits
how many bytes are there in an ethernet mac address?
6 bytes
how many hex digits in an ethernet mac address?
12 digits
who do vendors that sell ethernet devices need to register with?
IEEE
How many bytes is the part of the mac address that is assigned to the vendor.
3 bytes
what is the name of the mac address that is assigned to the vender?
Organizationally unique identifier OUI
How many hex digits is the 24 bit code of the mac address assigned to the vendor?
6 hex digits
When a computer starts up, what is the first thing the nic does?
it copies the MAC address from ROM to RAM
Which sublayer does each NIC in the network view the information?
NICs work at the MAC sublayer
What are the 2 styles of Ethernet framing?
- IEEE 802.3 2. The DIX Ethernet standard (Ethernet II)
Which frame format is used in TCP/IP networks?
Ethernet II
What is the difference of the 2 different ethernet frame formats?
802.3 adds the Start Frame Delimiter and changes the type field to the length field
What is a frame that is not at least 64 bytes in length?
collision fragment or runt frame
How may bytes must a frame be to not be discarded by receiving stations?
at least 64 bytes
What is the maximum allowable frame size?
1522 bytes
What are the primary fields in an IEEE 802.3 Ethernet frame?
Preamble, Start of frame delimiter, destination address, source address, length, 802.2 header and data, frame check sequence
how many bytes is the preamble of the 802.3 ethernet frame?
7 bytes
how big is the SFD of the 802.3 ethernet frame?
1 byte
how big is the destination address of an 802.3 ethernet frame
6 bytes
how big is the source address of an 802.3 ethernet frame
6 bytes
how big is the length field of an 802.3 ethernet frame?
2 bytes
how big is the header and data of an 802.3 ethernet frame?
46 to 1500 bytes
how big is the fcs field of an 802.3 ethernet frame?
4 bytes
802.3 Ethernet frame field uses pad to increase this frame field to at least 64 bytes
802.2 Header and data
802.3 Ethernet frame field describes which higher level protocol has been used
type
802.3 Ethernet frame field that shows the frame’s originating nic or interface MAC address
source address
802.3 Ethernet frame field that assists a host in determining if the frame received is addressed to it
destination address
802.3 Ethernet frame field that notifies destinations to get ready for a new frame
preamble
802.3 Ethernet frame field that synchronizes sending and receiving devices for frame delivery
start of frame delimitier
802.3 Ethernet frame field that detects errors in an ethernet frame
frame check sequence
