Week 1: IP & MAC PDU Format Flashcards
What is the Preamble of an IEEE802.3 MAC Frame made of?
Alternating 1’s & 0’s
How many bytes long is the Preamble of an IEEE802.3 MAC Frame?
7 Bytes
What is the Start Frame Delimiter (SDF) Binary value?
10101011
How many bytes long is the SDF of an IEEE802.3 MAC Frame?
1 Byte
How many bytes long is the Destination Address in an IEEE802.3 MAC Frame?
6 Bytes
How many bytes long is the Source Address in an IEEE802.3 MAC Frame?
6 Bytes
How many bytes long is the Length or Type field in an IEEE802.3 MAC Frame?
2 Bytes
How many bytes long is the CRC Field in an IEEE802.3 MAC Frame?
4 Bytes
What is the average byte length range of an IEEE802.3 MAC Frame?
64 to 1518 Bytes
What fields compose an IEEE802.3 MAC Frame?
Preamble (7 Bytes) SFD (1 Byte) Destination Address (6 Bytes) Source Address (6 Bytes) Length or Type (2 Bytes) Data & Padding (variable Byte length) CRC (4 Bytes)
How many Bytes are in a MAC Address?
6 Bytes (48 bits)
What do the left 3 Bytes in a MAC Address indicate?
The vendor
What do the right 3 Bytes in a MAC Address indicate?
Interface Card
this is Network Interface Controller (NIC) specific!
What are the left 3 bytes in a Multicast MAC Address?
01:00:5E
What is the MAC Address for a Broadcast?
FF:FF:FF:FF:FF:FF
What is the min-max range of bytes for an IPv4 Datagram?
Min. 20 Bytes, Max 60 Bytes
How many bits long is the Source IP Address field in an IPv4 Datagram?
32 Bits
How many bits long is the Destination IP Address field in an IPv4 Datagram?
32 bits
How many bits long is the Version field in an IPv4 Datagram?
4 bits
How many bits long is the Header Length field in an IPv4 Datagram?
4 bits
How many bits long is the Priority & Type of Service field in an IPv4 Datagram?
8 bits
How many bits long is the Identification field in an IPv4 Datagram?
16 bits
How many bits long is the Flag field in an IPv4 Datagram?
3 bits
How many bits long is the Fragmented Offset field in an IPv4 Datagram?
13 bits
How many bits long is the Time to Live field in an IPv4 Datagram?
8 bits
How many bits long is the Protocol field in an IPv4 Datagram?
8 bits
How many bits long is the Header Checksum field in an IPv4 Datagram?
16 bits
How many bits long is the Options field in an IPv4 Datagram?
0 or 32 bits
What field indicates the existence of optional headers in an IPv4 Datagram?
The Header Length field
What value indicates the length of the optional field(s)?
Any value more than 5
How many bits long is an IPv4 Address?
32 bits
What does the IP Address define?
A unique and universal connection of a device to the Internet
What is the total address space for IPv4?
2^32 or 4,294,967,296
What are the notation types for IPv4 address?
Dotted-Decimal and Binary Notation
What are the 5 Address Classes?
A (8 Network Bits, 24 Host Bits) B (16 Network Bits, 16 Host Bits) C (24 Network Bits, 8 Host Bits) D (Multicast) E (Research)
What is the Default CIDR subnet mask for Class A Addresses?
/8
255.0.0.0
What is the Default CIDR Subnet mask for Class B Addresses?
/16
255.255.0.0
What is the Default CIDR Subnet mask for Class C Addresses?
/24
255.255.255.0
What is the Multicast Address Range?
224.0.0.0 to 239.255.255.255
What are the 2 subtypes of Unicast Addressing?
Public & Private
What are the 4 properties of Private Addresses?
Private IP’s are NOT routable through the Internet
Secure
Save IP Address Space
Network Address Translation (NAT)
For Reserved Addresses, what does an address of all 0’s mean?
“This network or segment”
For Reserved Addresses, what does an address of all 1’s mean?
“All Networks”
For Reserved Addresses, what does the address 127.0.0.1 mean?
Loopback tests
For Reserved Addresses, what does a Node address of all 0’s mean?
Interpreted to mean “network address” or any host on specified network
For Reserved Addresses, what does a Node address of all 1’s mean?
Interpreted to mean “all nodes” on the specified network
For Reserved Addresses, what does a full IP address set to all 0’s mean?
Used by Cisco Routers to designate the default route.
For Reserved Addresses, what does a full IP address set to all 1’s mean?
Same as broadcast to all nodes on the current network (255.255.255.255)
What is the Address Range for Class A?
0 - 127
What is the Address Range for Class B?
128 - 191
What is the Address Range for Class C?
192 - 223
What is the Address Range for Class D?
224 - 239
What is the Address Range for Class E?
240 - 255
What are the 3 Private Address Segments?
- 0.0.0 /8 (10.0.0.0 - 10.255.255.255)
- 16.0.0 /12 (172.16.0.0 - 172.16.255.255)
- 168.0.0 /16 (192.168.0.0 - 192.168.255.255)