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Network Engineering > IP, MAC Address and PDU Format > Flashcards

IP, MAC Address and PDU Format Flashcards

1
Q

What is the preamble bit size for Ethernet II MAC Frame?

A

56 bits of alternating 0 and 1.

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2
Q

What is the frame length in bytes for Ethernet II MAC Frame?

A

64 to 1518 bytes.

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3
Q

What does EtherType 0x0800 represent?

A

IP packet.

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4
Q

What does EtherType 0x0806 represent?

A

ARP frame.

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5
Q

What is the size of EtherType in bytes?

A

2 bytes.

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6
Q

What is the sizes for destination and source MAC addresses in bytes and bits?

A

Each are 6 bytes or 48 bits.

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7
Q

What does EtherType 0x86DD represent?

A

IPv6.

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8
Q

What is the size of Cyclic redundancy check (CRC) in bytes?

A

4 bytes.

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9
Q

What is the purpose of CRC?

A

For detection of error in the received frame (uses 32 polynomial).

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10
Q

What is the left and right sections of a MAC address used for?

A
  • Left indicates vendor

- Right is interface card specific

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11
Q

What does a multicast address start with?

A

01:00:5E.

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12
Q

What does a broadcast address look like?

A

FF FF FF FF FF FF.

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13
Q

What is the range for Multicast IP addresses?

A

224.0.0.0 to 239.255.255.255

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14
Q

What is the range for Multicast MAC addresses?

A

01:00:5E:00:00:00 to 01:00:5E:7F:FF:FF

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15
Q

For an IPv4 datagram format what is the minimum and maximum values in bytes?

A
  • Minimum 20 bytes

- Maximum 60 bytes

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16
Q

What is the size of version IPv4 and IPv6 length in bits?

A
  • IPv4: 4 bits

- IPv6: 6 bits

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17
Q

What is the size of header length?

18
Q

What operation is done to make IP header an even multiple of 32 bits?

19
Q

Another name for Type of Service (TOS)?

A

Differentiated service.

20
Q

What is the size in bits of TOS?

21
Q

What do the first 3 bits in TOS represent?

A

Specifies priority with increasing value.

22
Q

What do the next 3 bits after the first initial 3 bits in TOS represent?

A

Indicates desire for low delay, high throughput and high reliability (default is 0)

23
Q

What is the size of Explicit Congestion Notification (ENC) in bits?

24
Q

In terms of ENC what does 10 or 01 indicate?

A

The ENC can be used.

25
In terms of ENC what does 11 indicate?
Congestion.
26
What is the length of payload in bits?
16 bits.
27
What is the length of fragmentation identification in bits and what does it do?
16 bits, unique packet identifier to manage fragmentation.
28
What is the length of fragment flag in bits?
3 bits.
29
What is the length of fragment offset in bits?
13 bits.
30
Define Time to Live (TTL) or Hop limit and its function and its size...
- Number of hops allowed before a packet is discarded - Breaks forwarding loop - 8 bits
31
What is the purpose of the header checksum and what is the size?
- 16 bit one's complement addition of the header, not including this field
32
What is the size of source and destination addresses in bits?
32 bits.
33
How many option fields can exist?
0 or more.
34
What indicates the existence of an option header?
Header length field.
35
What is another name for option field?
Variable length.
36
Classfull addressing is replaced with what?
Classless addressing.
37
Define unicast?
Public or private.
38
Given the broadcast address 255.255.255.255, what does it represent?
All systems on a local network.
39
Given the multicast address 224.0.0.1, what does it represent?
All systems on this subnet.
40
Given the multicast address 224.0.0.2, what does it represent?
All routers on this subnet.
41
Given the multicast address 224.0.0.0 to 224.0.0.255, what does it represent?
Are only for local subnet.
42
Give all the ranges of a private address...
- 10.0.0.0 - 10.255.255.255 - 172.16.0.0 - 172.31.255.255 - 192.168.0.0 - 162.168.255.255

Network Engineering (9 decks)

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