Chapter 1 - 3 Flashcards
Well-known services ports
0-1024
The name of the group responsible for drafting, testing, proposing and maintaining official internet standards.
IETF Internet Engineering task force
The group responsible for managing all internet domain names, network addresses and protocol parameters.
ICANN Internet corporation for assigned names and numbers
RFC
Request for comments
RFC process order
- Proposed Standard 2. Draft Standard 3. internet standard 4. retired standard or historic standard
OSI network reference layers
- Application layer 6. Presentation layer 5. Session layer 4. Transport layer 3. Network layer 2. Data link layer 1. Physical layer
Data link layer pdu
frames
Network layer pdu
packet
transport layer pdu
segment
Session layer includes mechanisms to maintain reliable ongoing conversations, called___
checkpoints
data link layer addressing
MAC address
Network layer addressing
IP address
Combining the various sources of outgoing data into a single output data stream is called___
multiplexing
______is the process of tapping into the network communications system, capturing packets that cross the network, gathering network statisticss, and decoding the packets into readable form.
protocol analysis
Three options for analyzing switched networks:
- Hubbing out 2. Port redirection 3. Remote monitoring
The minimum ethernet frame size is ___
64 bytes
The maximum ethernet frame size is ____
1518 bytes
Ethernet II frame structure
- Preamble 8 bytes 2. Destination address 6 bytes 3. Source address 6 bytes 4. type field 2 bytes 5. Data field 46-1500 bytes 6. Frame check sequence 4 bytes
Frame check sequence field includes the result of the ____
CRC
Flags field bit 0
reserved: set to 0
Flags field bit 1
Don’t fragment bit: 0=may fragment 1=don’t fragment
Flags field bit 2
More fragments bit: 0=last fragment; 1=more to come
IP protocol field # 1
ICMP
IP protocol field #6
TCP
IP protocol field #17
UDP
The primary function of the _______layer is to provide a globally unique address to every host on the internet and paths to and from hosts.
network
When two or more RFCs cover the same topic they usually also share the same title. True or false
True
_________involves cutting up a big message into a numbered sequence of chunks, called segments, in which each chunk represents the maximum data payload that the network media can carry between sender and receiver.
segmentation
The Session layer includes mechanisms to maintain reliable ongoing conversations, called ____________________.
checkpoints
The most important TCP/IP Network Access layer protocol is ____________________.
PPP Point-to-Point-Protocol point-to-point-protocol
TCP/IP application processes are sometimes called ____ and are identified by port numbers.
network services
____ is considered a premium service connection, offering a service that appears as a “virtual lease line” between end points.
expedited forwarding
____ is used to obtain an IP address for an associated data link address.
RARP
The ____ field provides error detection on the contents of the IP header only.
IP header checksum
IP fragmentation enables a larger packet (for example, a token ring 4,096-byte packet) to be automatically fragmented by a ____ into smaller packets to cross a link that supports a smaller MTU, such as an Ethernet link.
router
____ was designed to provide devices with a method for notifying each other that a link is experiencing congestion before the routers start to drop packets.
Explicit Congestion Notification
The ____________________ field is a two-byte field that provides bit-level integrity checks for data as sent.
FCS Frame-check-sequence
When a packet is fragmented, all fragments are given different TTL values. true of false
false
0x0800
IPv4
0x0806
ARP
IP Header fields
- Version 2. Hdr length 3. Type of Service 4. Total lenght 5. Identification 6. Flags 7. Fragment offset 8. Time to live 9. Protocol 10. Header checksum 11. Source IP 12. Dest IP 13. Options (if any)
