001-006 Flashcards
(90 cards)
1
Q
is the exchange of data between two devices via a transmission medium
A
Data Communications
2
Q
Four Fundamental Characteristics of Data Communications
A
- Delivery
- Accuracy
- Timeliness
- Jitter
3
Q
Data Representations
A
- Text
- ASCII
- Extended ASCII
- UNICODE
- ISO
- Numbers
- Images
- Audio
- Video
4
Q
Direction of Data Flow
A
- Simplex - one way
- Half Duplex - one at a time
- Full Duplex - both all the time
5
Q
Set of devices connected by communication links
A
Network
6
Q
When task is divided among computers
A
Distributed processing
7
Q
Network Criterias
A
- Performance
- Reliability
- Security
8
Q
Types of Connection
A
- Point-to-Point
- Multipoint
9
Q
Physical Topologies
A
- Mesh
- Star
- Bus
- Ring
10
Q
Every device has a dedicated point to point link to every other device
A
Mesh topology
11
Q
Every device has a dedicated point to point link only to a central controller
A
Star topology
12
Q
- is multipoint.
- One long cable acts as a backbone to link all the devices in a network
A
Bus topology
13
Q
each device has a dedicated point-to-point connection with only the two devices on either side of it.
A
Ring topology
14
Q
Categories of Network
A
LAN
MAN
WAN
15
Q
Early: 4-16 Mbps
Today: 100-1000 Mbps
A
LAN
16
Q
- Group of connected communicating devices
- 2 or more network that can communicate with each other
A
Internet
17
Q
Set of rules that governs data comms
A
Protocols
18
Q
It is the structure or format of the data
A
Syntax
19
Q
It is the meaning of each section of bits
A
Semantics
20
Q
It is when data should be sent and how fast it should be sent
A
Timing
21
Q
Data Communication Standards
A
de facto
de jure
22
Q
Standards that have not been approved but adopted as one
A
de facto
23
Q
Officially recognized standards
A
de jure
24
Q
Standards Organizations
A
ISO
ITU-T
ANSI
IEEE
EIA
25
OSI MODEL LAYERS
APSTNDP
26
It is the adding of headers/data packets
Encapsulation
27
removing of headers/data packets
Decapsulation
28
Provides interface to the network
Application layer
29
Converts codes & reformats data
Presentation layer
30
Layer concerned w/ syntax and semantics of data transmitted
Presentation layer
31
Coordinates interaction between end-to-end application process
Session layer
32
handles reliable delivery of messages
Transport layer
33
Routed Protocols
IP
AppleTalk
IPX
34
Routing Protocols
Distance Vector
Link State
Hybrid
35
Types of Distance Vector Routing protocols
RIP
IGRP
36
Types of Link State Routing protocols
OSPF
IS-IS
37
Types of Hybrid Routing protocols
EIGRP
38
Layer responsible for framing, error control, and flow control
Data Link layer
39
Layer 2 Devices
Bridge (software based)
Switch (ASIC based)
40
Take Note
Encapsulation
App data:
Data Unit
TCP header + App Data:
Segment
IP header + TCP header + App data:
Packet
Data link + TCP header + App data:
Frame
10010001000100:
Bit stream
41
Provides hardware addressing
MAC sublayer
42
Common Methods of MAC
Contention
- CSMA/CD (IEEE 802.3)
Token Passing
- Token Bus (IEEE 802.4)
- Token Ring (IEEE 802.5)
Polling
- Any LAN (IEEE 802.12)
43
TCP/IP Layers
Application layer
Transport layer
Internet layer
Network Interface layer
44
Application, presentation, and session layer of the OSI Model corresponds to what layer of the TCP/IP Model?
Application layer
45
Transport layer of the OSI Model corresponds to what layer of the TCP/IP Model?
Transport
46
Network layer of the OSI Model corresponds to what layer of the TCP/IP Model?
Internet layer
47
Data link and Physical layer of the OSI Model corresponds to what layer of the TCP/IP Model?
Network Interface layer
48
Provides Ip address-to-MAC address name address resolution
Address Resolution Protocol (ARP)
49
Enables the workstation to boot without requiring a hard or floppy disk drive.
Bootstrap Protocol (BootP)
50
- Permits a physical address, such as an Ethernet address, to be translated into an Ip address.
- define in RFC 903
Reverse Address Resolution Protocol (RARP)
51
It is a connectionless protocol that makes routing path decisions, based on the information it receives from ARP.
Internet Protocol (IP)
52
It is the main protocol of TCP/IP protocol
Internet Protocol (IP)
53
It provides connection-oriented services and performs segment sequencing and service addressing.
Transmission Control Protocol (TCP)
54
- It is like TCP but not connection-oriented
- travels data faster but not reliable
User Datagram Protocol (UDP)
55
Used by web browsers and web servers to exchange files through the world wide web and intranets.
HyperText Transfer Protocol (HTTP)
56
Secures messages being transmitted on the Internet.
Secure Socket Layer (SSL)
57
Ensures that messages transferred on the internet are private and tamper proof
Transport Layer Security (TLS)
58
Provides a generic method of transferring files
File Transfer Protocol (FTP)
59
- Lets you transfer files between a host and an FTP server.
- It provides no authentication and uses UDP instead of TCP
Trivial File Transfer Protocol (TFTP)
60
File transfer protocol that uses Secure Shell
Secure File Transfer Protocol (SFTP)
61
SSH stands for
Secure Shell
62
Is used to route electronic mail through the internetwork.
Simple Mail Transfer Protocol (SMTP)
63
Is an email retrieval protocol designed to enable users to access their email from various locations ...
Internet Message Access Protocol (IMAP)
64
Designed for managing Complex Networks
Simple Network Management Protocol (SNMP)
65
Acts as a dumb terminal
Telnet
66
Allows for secure interactive control of remote systems.
Secure Shell (SSH)
67
Enables users on various platforms to seamlessly access files from remote file systems
Network File System (NFS)
68
Establishes connection between printing devices and workstations
Line Printer Daemon (LPD)
or
Line Print Remote (LPR)
69
Distributed through the internetwork to provide address/name resolution
Domain Name System (DNS)
70
Used to communicate time synchronization information between systems on a network
Network Time Protocol (NTP)
71
allow searching and updating of a directory service
Lightweight Directory Access Protocol (LDAP)
72
oversees global IP address allocation
Internet Assigned Numbers Authority (IANA)
73
ICANN
Internet Corporation for Assigned Names and Numbers
74
ICANN Categories of Ports
Well Known
Registered
Dynamic
75
Ports
- Assigned for specific protocols and services
- Ranges from 0 to 1023
Well Known Ports
76
Port numbers range from 1024 to 49151
Registered
77
Port numbers range from 49152 to 65535
Dynamic
78
Identifies both the logical host and the logical network addresses
Ip Address
79
Identifies which portion of the IP address is the network address
Subnet Mask
80
Identifies the router to which packets from remote networks are sent
Default Gateway
81
Identifies the DNS server that is used to resolve host names to IP addresses
DNS Server
82
Identifies the logical name of the local system
Host name
83
Identifies the physical Address
MAC Address
84
- Most widely installed local area network technology
- originally developed by Xerox
Ethernet
85
Is defined by data link and physical layer
Ethernet
86
Used to map data to a particular process running in a computer
Ports
87
Each host can have ______ ports per IP address
65000
88
T568A Standard cable connection
WG, G, WO, B, WBl, O, WBr, B
89
T568B Standard cable connection
WO, O, WG, B, WBl, G, WBr, B
90
