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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?

A

4 bits.

18
Q

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

A

Padding.

19
Q

Another name for Type of Service (TOS)?

A

Differentiated service.

20
Q

What is the size in bits of TOS?

A

6 bits.

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?

A

2 bits.

24
Q

In terms of ENC what does 10 or 01 indicate?

A

The ENC can be used.

25
Q

In terms of ENC what does 11 indicate?

A

Congestion.

26
Q

What is the length of payload in bits?

A

16 bits.

27
Q

What is the length of fragmentation identification in bits and what does it do?

A

16 bits, unique packet identifier to manage fragmentation.

28
Q

What is the length of fragment flag in bits?

A

3 bits.

29
Q

What is the length of fragment offset in bits?

A

13 bits.

30
Q

Define Time to Live (TTL) or Hop limit and its function and its size…

A
  • Number of hops allowed before a packet is discarded
  • Breaks forwarding loop
  • 8 bits
31
Q

What is the purpose of the header checksum and what is the size?

A
  • 16 bit one’s complement addition of the header, not including this field
32
Q

What is the size of source and destination addresses in bits?

A

32 bits.

33
Q

How many option fields can exist?

A

0 or more.

34
Q

What indicates the existence of an option header?

A

Header length field.

35
Q

What is another name for option field?

A

Variable length.

36
Q

Classfull addressing is replaced with what?

A

Classless addressing.

37
Q

Define unicast?

A

Public or private.

38
Q

Given the broadcast address 255.255.255.255, what does it represent?

A

All systems on a local network.

39
Q

Given the multicast address 224.0.0.1, what does it represent?

A

All systems on this subnet.

40
Q

Given the multicast address 224.0.0.2, what does it represent?

A

All routers on this subnet.

41
Q

Given the multicast address 224.0.0.0 to 224.0.0.255, what does it represent?

A

Are only for local subnet.

42
Q

Give all the ranges of a private address…

A
  • 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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