Net + Mod 7 Explaining Application Services Flashcards

Question

Answer 1

A

TLS: A security protocol that uses certificates for authentication and encryption that provides end-to-end security to protect web communications and other application protocols

not a protocol w/ a dedicated port #
layer between the Application and Transport layers of the TCP/IP stack OSI between Session & Presentation

Answer 2

A

Digital Certificate: implement TLS,
- Identification and authentication information presented in the X.509 format and issued by a certificate authority (CA) as a guarantee that a key pair (as identified by the public key embedded in the certificate) is valid for a particular subject (user or host)

Public Key: freely distributed and is used to encrypt data, which can only be decrypted by the linked private key in the pair.

Private Key: known only to the holder and is linked to, but not derivable from, a public key distributed to those with whom the holder wants to communicate securely

Cipher Suite: Lists of cryptographic algorithms that a server and client can use to negotiate a secure connection

Answer 3

A

NTP: enables the synchronization of these time-dependent applications, UDP port 123

GPS: A means of determining a receiver’s position on Earth based on information received from orbital satellites

Time drift is when a system’s clock begins to deviate from the source clock
- Slow Method: If the time is off by only a few seconds, adjusts the time a few milliseconds
- Slam Method: hard reset the time

NTS: Network Time Security (NTS) works on TCP port 4460

Answer 4

A

Precision Time Protocol: Provides clock synchronization to network devices to a higher degree of accuracy than Network Time Protocol (NTP), nanosecond precision

Grandmaster Clock: authoritative time source within a PTP domain
- timeTransmitter
Boundary Clock: one with interfaces in multiple PTP segments
- timeReceiver role
Ordinary Clock: one with a single PTP interface
timeReceiver role
two clocks are connected, one interface has a timeTransmitter role, and the other has a timeReceiver role

Answer 5

A

Web Servers
- Dedicated Server: ISP allocates your own private server computer, unmanaged (or additional cost)

Virtual Private Server (VPS): ISP allocates you a virtual machine (VM) on a physical server, isolated from other customer instances
Cloud Hosting: Your website is run on a cloud over several hardware computers, allowing more scalability if demand patterns change
Shared Hosting: Your website is hosted within a private directory on a shared server, performance affected by other sites hosted on server

Main Web Server: Apache, Microsoft Internet Information Services (IIS), NGINX

Answer 6

A

HTTPS port 443

Answer 7

A

FTP port 20/21: administrative upload/download of files to and from servers and appliances

Trivial File Transfer Protocol (TFTP) is a connectionless protocol running over UDP port 69.

Answer 8

A

SFTP port 22: addresses the privacy and integrity issues of FTP by encrypting the authentication and data transfer between client and server

Answer 9

A

SMB port 445: requesting files from Windows servers and delivering them to clients, share files and printers

Answer 10

A

NAS: device dedicated to performing a file server role, uses a bespoke operating system LINUX
- support RAID

Answer 11

A

Provisions information in a format that can be read and updated through some type of query language

Structured Query Language (SQL): Programming and query language common to many relational database management systems

Answer 12

A

SMTP: Electronic mail enables a person to compose a message and send it to another user on their own network

Delivery / Mail protocol
- Local Mail Client
- Local SMTP Server
- Remote SMTP Server
- Remote Mail Client

STARTTLS: Deprecated, explicit TLS or opportunistic TLS

Implicit TLS: establishes the secure connection before any SMTP commands

Port 25: message relay between SMTP servers, or message transfer agents (MTAs)
Port 465: SMTP Submission with implicit TLS
Port 587: SMTP Submission with explicit TLS

Answer 13

A

IMAP Port 143: used mail retrieval protocol, insecure
IMAPs Port 993: secure IMAP

Answer 14

A

VoIP
- Private branch exchange (PBX): automated switchboard providing a single connection point for an organization’s voice lines

VoIP PBX establishes connections between local VoIP endpoints with data transmitted over the local Ethernet network, route incoming and outgoing calls from and to external networks

Software VoIP: (3cx.com) and Asterisk (asterisk.org)

Answer 15

A

Session control: Used to establish, manage, and disestablish communications sessions, discovery, availability, negotiating, session management/termination

Data Transport: Handles the delivery of the actual video or voice information

QoS (Quality of Service): Provides information about the connection to a QoS system, ensures that voice or video communications are free from problems, dropped packets, delay, or jitter

Answer 16

Study These Flashcards

A

Used to establish, disestablish, and manage VoIP and conferencing communications sessions. It handles user discovery (locating a user on the network), availability advertising (whether a user is prepared to receive calls), negotiating session parameters (such as use of audio/ video), and session management and termination

Real-time Transport Protocol (RTP) - actual delivery of real-time data uses different protocols