Lesson 4 - Session, Presentation and Application Layers Flashcards
Which Layer controls the communications from one endpoint to another.
Session layer
Name 3 Common Layer 5 modes of communicating
Full Duplex - Phone Communications
Half Duplex - two way radios
Simplex - Source can only send. Destination cannot respond
Name some common Layer 5 Protocols
H.2254
L2TP
NetBIOS
RPC
SMB
SOCKs
What main purpose of Presentation Layer (6)
Responsible for formatting and coding Application Layer data into a form that is acceptable for transmitting on the network
Which Layer would be responsible for formatting and encrypting of data
Presentation Layer
Name Some Common Protocols at the Presentation Layer
IMAP - Email
SSH - Secure Shell - cryptographic protocol
SSL - Secure Sockets Layer
TLS - successor to SSL - Transport Layer Security
Besides Encryption and Formatting what is another key function
Converting data into standard formats for application program use such as:
ASCII, ETCDIC, TIFF, JPEG, GIF, etc
Which layer only interacts directly with Human Beings
Layer 7 Application using User Interface
Name common Layer 7 Protocols
DHCP
FTP
HTTP
NFS
SMTP
SIP
SNMP
Telnet
True or False a Word Processor operates at Layer 7
False - that is not the type of application that this level is referring to
Which Port does HTTPS Use
443
Bonus - is aTCP Protocol
Which Port does FTP Use
20 and 21
Which Port does SMTP Use
25
Bonus - Is a UDP Protocol
Which Port Does Telnet Use
23
What Service does Port 80 Use
HTTP
Which Service does Port 53 Use
DNS
Which Services does Port 69 Use
Trivial File Transfer Protocol (TFTP)
Name the Most Common Application Architectures
Host-Based
Client-Based
Client/Server
Cloud Computing
Peer to Peer
What was the main pitfall for Client Based (Diskless) Applications
Saturation of network
What is the term for multiple appServers
N-tier
What is the rapidly emerging use case for untrusted P2P applications
Blockchain
What is an instance of a service listening for traffic on a specific port called
Socket
Where did what we call the Internet originate from
DOD used a network called ARPANET for research. Educational institutions and then Large Corp started using it.
In 1989 what English Computer Scientist proposed a novel way to connect resources across the Internt
Tim Berner-Lee created World Wide Web and created a new protocol called the Browser in 1991
