Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CompTIA Network+ Acronyms > Acronyms > Flashcards

Acronyms Flashcards

1
Q

AAA

A

Authentication authorization and accounting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

AAAA

A

Authentication, authorization, accounting, and audit in

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

ACL

A

Access control list

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

ADSL

A

Asymmetric digital subscriber line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

AES

A

Advanced Encryption standard

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

AH

A

Authentication Header

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

AP

A

Access point

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

APC

A

Angle Polished connector

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

APIPA

A

Automatic private Internet protocol addressing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

APT

A

Advanced Persistent Tool

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

ARIN

A

American registry for Internet numbers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

ARP

A

Address resolution protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

AS

A

Autonomous system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

ASIC

A

Application specific integrated circuit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

ASP

A

Application service provider

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

ATM

A

Asynchronous transfer mode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

AUP

A

Acceptable use policy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

BCP

A

Business continuity Plan

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

BERT

A

Bit-error rate test

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

BGP

A

Border Gateway Protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

BLE

A

Bluetooth low energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

BNC

A

British Naval Connector/Bayonet Niell- concelman

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

BootP

A

Boot Protocol / bootstrap protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

BPDU

A

Bridge protocol data unit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

BRI

A

Basic Rate Interface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

BSSID

A

Basic service set identifier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

BYOD

A

Bring your own device

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

CaaS

A

Communication as a service

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

CAM

A

Content addressable memory

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

CAN

A

Campus area network

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

CARP

A

Common address redundancy Protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

CASB

A

Cloud Access Security Broker

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

CAT

A

Category

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

CCTV

A

Closed circuit tv

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

CDMA

A

Code Division Multiple access

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

CSMA/CD

A

Carrier Sense Multiple Access/Collision Detection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

CHAP

A

Challenge Handshake authentication protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

CIDR

A

Classless Inter- domain routing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

CNAME

A

Canonical name

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

CoS

A

Class of service

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

CPU

A

Central processing unit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

CRAM-MD5

A

Challenge - response authentication mechanism - message digest 5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

CRC

A

Cyclic redundancy checking

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

CSMA/CA

A

Carrier since multiple access/collision avoidance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

CSU

A

Channel service unit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

CVW

A

Collaborative virtual workspace

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

CWDM

A

Course wave division multiplexing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

DaaS

A

Desktop as a service

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

dB

A

Decibel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

DCS

A

Distributed computer system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

DDos

A

Distributed Denial of Service

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

DHCP

A

Dynamic host configuration protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

DLC

A

Data link control

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

DLP

A

Data Loss Prevention

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
55
Q

DLR

A

Device level ring

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
56
Q

DMZ

A

Demilitarized zone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
57
Q

DNAT

A

Destination network address translation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
58
Q

DNS

A

Domain Name Service/Domain Name server/domain name system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
59
Q

DOCSIS

A

Data over cable service interface specification

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
60
Q

DoS

A

Denial of service

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
61
Q

DR

A

Designated Router

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
62
Q

DSCP

A

Differentiated services code point

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
63
Q

DSL

A

Digital subscriber line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
64
Q

DSSS

A

Direct sequence spread spectrum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
65
Q

DSU

A

Data service unit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
66
Q

DWDM

A

Dense wavelength division multiplexing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
67
Q

E1

A

E-carrier level 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
68
Q

EAP

A

Extensible Authentication protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
69
Q

EDNS

A

Extension mechanism for DNS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
70
Q

EGP

A

Exterior gateway protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
71
Q

EIA/TIA

A

Electronic industries alliance/telecommunication industries Association

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
72
Q

EMI

A

Electromagnetic interference

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
73
Q

ESD

A

Electrostatic discharge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
74
Q

ESP

A

Encapsulated security payload

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
75
Q

ESSID

A

Extended service set identifier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
76
Q

EUI

A

Extended Unique identifier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
77
Q

FC

A

Fiber channel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
78
Q

FCoE

A

Fiber channel over Ethernet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
79
Q

FCS

A

Frame Check sequence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
80
Q

FDM

A

Frequency division multiplexing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
81
Q

FHSS

A

Frequency Hopping Spread Spectrum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
82
Q

FM

A

Frequency modulation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
83
Q

FQDN

A

Fully qualified domain name

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
84
Q

FTP

A

File Transfer Protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
85
Q

FTPS

A

File transfer protocol security

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
86
Q

GBIC

A

Gigabit interface converter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
87
Q

GBPs

A

Gigabits per second

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
88
Q

GLBP

A

Gateway load balancing protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
89
Q

GPG

A

GNU privacy protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
90
Q

GRE

A

Generic routing encapsulation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
91
Q

GSM

A

Global system for mobile communication

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
92
Q

HA

A

Hi availability

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
93
Q

HDLC

A

High level data link control

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
94
Q

HDMI

A

High definition multimedia interface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
95
Q

HIDS

A

Host intrusion detection system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
96
Q

HIPS

A

Host intrusion prevention system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
97
Q

HSPA

A

Hi speed packet access

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
98
Q

HSRP

A

Hot standby router protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
99
Q

HT

A

High throughput

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
100
Q

HTTP

A

Hypertext transfer protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
101
Q

HTTPS

A

Hypertext transfer protocol secure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
102
Q

HVAC

A

Heating ventilation and air-conditioning

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
103
Q

Hz

A

Hertz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
104
Q

IaaS

A

Infrastructure as a service

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
105
Q

IANA

A

Internet assigned numbers authority

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
106
Q

ICA

A

Independent computer architecture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
107
Q

ICANN

A

Internet corporation for assigned names and numbers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
108
Q

ICMP

A

Internet control message protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
109
Q

ICS

A

Internet connection sharing/industrial control system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
110
Q

IDF

A

Intermediate distribution frame

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
111
Q

IDS

A

Intrusion detection system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
112
Q

IEEE

A

Institute of electrical and electronics engineers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
113
Q

IGMP

A

Internet group message protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
114
Q

IGP

A

Interior gateway protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
115
Q

IGRP

A

Interior gateway routing protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
116
Q

IKE

A

Internet key exchange

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
117
Q

IMAP4

A

Internet message access protocol version 4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
118
Q

InterNIC

A

Internet network information center

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
119
Q

IoT

A

Internet of things

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
120
Q

IP

A

Internet protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
121
Q

Ips

A

Intrusion prevention system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
122
Q

IPSec

A

Internet protocol security

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
123
Q

IPV4

A

Internet protocol version four

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
124
Q

IPV6

A

Internet protocol version six

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
125
Q

ISAKMP

A

Internet security association and key management protocol

126
Q

ISDN

A

Integrated services digital network

127
Q

IS-IS

A

Intermediate system to intermediate system

128
Q

ISP

A

Internet service provider

129
Q

ITS

A

Intelligent transportation system

130
Q

IV

A

Initialization vector

131
Q

Kbps

A

Kilobytes per second

132
Q

KVM

A

Keyboard video mouse

133
Q

L2TP

A

Layer 2 tunneling protocol

134
Q

LACP

A

Link aggregation control protocol

135
Q

LAN

A

Local area network

136
Q

LC

A

Local connector

137
Q

LDAP

A

Light weight directory access protocol

138
Q

LEC

A

Local exchange curious

139
Q

LEC

A

Light emitting diode

140
Q

LLC

A

Logical link control

141
Q

LLDP

A

Link layer discovery protocol

142
Q

LSA

A

Link state advertisements

143
Q

LTE

A

Long term evolution

144
Q

LWAPP

A

Light weight access point protocol

145
Q

Maas

A

Mobility as a service

146
Q

MAC

A

Media access control/medium access control

147
Q

MAN

A

Metropolitan area network

148
Q

Mbps

A

Megabytes per second

149
Q

MDF

A

Main distribution frame

150
Q

MDI

A

Media dependent interface

151
Q

MDIX

A

Media dependent interface crossover

152
Q

MGCP

A

Media gateway control protocol

153
Q

MIB

A

Management information base

154
Q

MIMO

A

Multiple input, multiple outlet

155
Q

MLA

A

Master license agreement/multi layer agreement

156
Q

MOU

A

Memorandum of understanding

157
Q

MPLS

A

Multi protocol label switching

158
Q

MS-CHAP

A

Microsoft challenge handshake authentication protocol

159
Q

MSDS

A

Material safety data sheet

160
Q

MT-RJ

A

Mechanical transfer register Jack

161
Q

MTU

A

Maximum transmission unit

162
Q

MTTR

A

Mean time to recovery

163
Q

MTBF

A

Meantime between failures

164
Q

MU-MIMO

A

Multiuser multiple input, multiple outputs

165
Q

MX

A

Mail exchange

166
Q

NAC

A

Network access control

167
Q

NAS

A

Network attached storage

168
Q

NAT

A

Network address translation

169
Q

NCP

A

Network control protocol

170
Q

NDR

A

Non-delivery receipt

171
Q

NetBEUI

A

Network basic input/output system

172
Q

NFC

A

Near field communication

173
Q

NFS

A

Network file service

174
Q

NGFW

A

Next generation firewall

175
Q

NIC

A

Network interface card

176
Q

NIDS

A

Network intrusion detection system

177
Q

NIPS

A

Network intrusion prevention system

178
Q

NIU

A

Network interface unit

179
Q

nm

A

Nanometer

180
Q

NNTP

A

Network news transport protocol

181
Q

NTP

A

Network time protocol

182
Q

OCSP

A

Online certificate status vertical

183
Q

OCx

A

Optical carrier

184
Q

OPI

A

Open system interconnect

185
Q

OSPF

A

Open shortest path first

186
Q

OTDR

A

Optical time domain reflectometor

187
Q

OUI

A

Organizationally unique identifier

188
Q

PaaS

A

Platform as a service

189
Q

PAN

A

Personal area network

190
Q

PAP

A

Password authentication protocol

191
Q

PAT

A

Port address translation

192
Q

PCM

A

Phase change memory

193
Q

PDoS

A

Permanent denial of service

194
Q

PDU

A

Protocol data unit

195
Q

PGP

A

Pretty good privacy

196
Q

PKI

A

Public key infrastructure

197
Q

PoE

A

Power over ethernet

198
Q

POP

A

Post office protocol

199
Q

POP3

A

Post office protocol version three

200
Q

POTS

A

Plain old telephone service

201
Q

PPP

A

Point-to-point protocol

202
Q

PPPoE

A

Point to point protocol over ethernet

203
Q

PPTP

A

Point-to-point tunneling protocol

204
Q

PRI

A

Primary rate interface

205
Q

PSK

A

Pre-shared key

206
Q

PSTN

A

Public switch telephone network

207
Q

PTP

A

Point-to-point

208
Q

PTR

A

Pointer

209
Q

PUA

A

Privileged user agreement

210
Q

PVC

A

Permanent virtual circuit

211
Q

QoS

A

Quality of service

212
Q

QSFP

A

Quad small form factor pluggable

213
Q

RADIUS

A

Remote authentication dial-in user service

214
Q

RARP

A

Reverse address resolution protocol

215
Q

RAS

A

Remote access service

216
Q

RDP

A

Remote desktop protocol

217
Q

RF

A

Radio frequency

218
Q

RFI

A

Radio frequency interference

219
Q

RG

A

Radio guide

220
Q

RIP

A

Routing Internet protocol

221
Q

RJ

A

Register Jack

222
Q

RPO

A

Recovery point objective

223
Q

RSA

A

Rivest, Shamir, Adelman

224
Q

RSH

A

Remote shell

225
Q

RSTP

A

Rapid spanning tree protocol

226
Q

RTO

A

Recovery time objective

227
Q

RTP

A

Real time protocol

228
Q

RTSP

A

Real time streaming protocol

229
Q

RTT

A

Round-trip time or real transfer time

230
Q

SA

A

Security association

231
Q

SaaS

A

Software as a service

232
Q

SC

A

Standard connector/subscriber connector

233
Q

SCADA

A

Supervisory control and data acquisition

234
Q

SCP

A

Secure copy protocol

235
Q

SDLC

A

Software development lifecycle

236
Q

SDN

A

Software defined network

237
Q

SDP

A

Session description protocol

238
Q

SDSL

A

Symmetrical digital subscriber line

239
Q

SFP

A

Small form factor pluggable

240
Q

SFTP

A

Secure file transfer Protocol

241
Q

SHA

A

Secure hash algorithm

242
Q

SIEM

A

Security information and event management

243
Q

SIP

A

Session initiation protocol

244
Q

SLAAC

A

Stateless address auto configuration

245
Q

SLIP

A

Cereal line Internet protocol

246
Q

SMB

A

Server message block

247
Q

SMF

A

Single mode fiber

248
Q

SMS

A

Short message service

249
Q

SMTP

A

Simple mail transfer protocol

250
Q

SNAT

A

Static network address translation/source network address translation

251
Q

SNMP

A

Simple network management protocol

252
Q

SNTP

A

Simple network time protocol

253
Q

SOHO

A

Small office home office

254
Q

SONET

A

Synchronous optical network

255
Q

SOP

A

Standard operating procedure

256
Q

SOW

A

Statement of work

257
Q

SPB

A

Shortest path bridging

258
Q

SPI

A

Stateful packet inspection

259
Q

SPS

A

Standby power supply

260
Q

SSID

A

Service set identifier

261
Q

SSL

A

Secure sockets layer

262
Q

ST

A

Straight tip or snap twist

263
Q

STP

A

Spanning tree protocol/shielded twisted pair

264
Q

SVC

A

Switched virtual circuit

265
Q

SYSLOG

A

System log

266
Q

T1

A

Terrestrial carrier level one

267
Q

TA

A

Terminal adapter

268
Q

TACACS

A

Terminal access control access control system

269
Q

TACACS+

A

Terminal access control access control system plus

270
Q

TCP

A

Transmission control protocol

271
Q

TCP/IP

A

Transmission control protocol/Internet protocol

272
Q

TDM

A

Time division multiplexing

273
Q

TDR

A

Time domain reflectometer

274
Q

Telco

A

Telecommunications company

275
Q

TFTP

A

Trivial file transfer protocol

276
Q

TLS

A

Transport layer of security

277
Q

TMS

A

Transportation management system

278
Q

TOS

A

Type of service

279
Q

TPM

A

Trusted platform module

280
Q

TTL

A

Time to live

281
Q

TTLS

A

Tunnel transport layer security

282
Q

UC

A

Unified communications

283
Q

UDP

A

User datagram protocol

284
Q

UNC

A

Universal naming convention

285
Q

UPC

A

Ultra polished connector

286
Q

UPS

A

Uninterruptible power supply

287
Q

URL

A

Uniform resource locator

288
Q

USB

A

Universal serial bus

289
Q

UTM

A

Unified threat management

290
Q

UTP

A

Unshielded twisted pair

291
Q

VDSL

A

Variable digital subscriber line

292
Q

VLAN

A

Virtual local area network

293
Q

VoIP

A

Voice over IP

294
Q

VPN

A

Virtual private network

295
Q

VRF

A

Virtual routing forwarding

296
Q

VRRP

A

Virtual router redundancy protocol

297
Q

VTC

A

Video teleconference

298
Q

VTP

A

VLAN Trunk protocol

299
Q

WAF

A

Web application firewall

300
Q

WAN

A

Wide area network

301
Q

WAP

A

Wireless application protocol/wireless access point

302
Q

WEP

A

Wired equivalent privacy

303
Q

WLAN

A

Wireless local area network

304
Q

WMS

A

Warehouse management system

305
Q

WPA

A

Wi-Fi protected access

306
Q

WPS

A

Wi-Fi protected set up

307
Q

WWN

A

World wide name

308
Q

XDSL

A

Extended digital subscriber line

309
Q

XML

A

Extensible markup language

310
Q

Zeroconf

A

Zero configuration

CompTIA Network+ Acronyms (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions