OSI, TCP/IP Flashcards
ISO-OSI layers 1,2,3 together called
1) network support layers
2) user support layers
network support layers
ISO-OSI layers 5,6,7 together called
1) network support layers
2) user support layers
user support layers.
they allow interoperability among unrelated software systems
________ensures end-to-end reliable data transmission
1) Data link layer
2) Network Layer
3) Transport layer
ransport layer
Entities in the same layer on different computers are called _______ entities
1) peer
2) equivalent
peer
OSI interface data unit (IDU) consists of
1) protocol data unit (PDU)
2) interface control information (ICI)
3) both
both
________ layer defines the direction of transmission between two devices: simplex, half-duplex etc
1) Physical layer
2) Data link layer
3) Network Layer
Physical layer
________ layer defines the network topology star, mesh etc.
1) Physical layer
2) Data link layer
3) Network Layer
Physical layer
____ is responsible for node-to-node delivery
1) Physical layer
2) Data link layer
3) Network Layer
Data link layer
____ is responsible for source-to destination delivery
1) Physical layer
2) Data link layer
3) Network Layer
4) Transport layer
Network Layer
______ ensures that messages are delivered error-free, in sequence, and
with no losses or duplications
1) Physical layer
2) Data link layer
3) Network Layer
4) Transport layer
Transport layer
_______ can be either connectionless or connection-oriented.
1) Physical layer
2) Data link layer
3) Network Layer
4) Transport layer
Transport layer
Error control is performed in
1) Physical layer
2) Data link layer
3) Network Layer
4) Transport layer
2 and 4
Data link layer - across a link
Transport layer - end to end
_______ is the network dialog controller
1) Network Layer
2) Transport layer
3) Session layer
4) Presentation layer
Session layer
________ allows a process to add checkpoints (synchronization points) into a stream of data.
1) Network Layer
2) Transport layer
3) Session layer
4) Presentation layer
Session layer
______ allows the communication between two processes to take place either in half-duplex or full-duplex
??
Session layer
(dialog control)
_________is concerned with the syntax and semantics of the information
exchanged between two systems.
1) Transport layer
2) Session layer
3) Presentation layer
4) Application Layer
Presentation layer
____ allows encryption, decryption and compression
1) Transport layer
2) Session layer
3) Presentation layer
4) Application Layer
Presentation layer
no headers or trailers are added at this layer
1) Transport layer
2) Session layer
3) Presentation layer
4) Application Layer
Application Layer
______ allows FTAM
1) Transport layer
2) Session layer
3) Presentation layer
4) Application Layer
Application Layer
File transfer, access, and management (FTAM)
The TCP/IP protocol suite
maps to a four-layer conceptual model known as the _______ model
1) DAPRA
2) DARPA
DARPA
named after the U.S. government agency that initially developed TCP/IP.
TCP four layers are
Application,
Transport,
Network or Internet
and __
1) Physical
2) Data link or network interface
Data link or network interface
________ resolves the network layer address to a link layer address such as a hardware address.
1) TCP
2) ARP
3) ICMP
4) IGMP
Address Resolution Protocol (ARP)
_____ reports errors and other information to help you diagnose unsuccessful packet delivery.
1) TCP
2) ARP
3) ICMP
4) IGMP
Internet Control Message Protocol (ICMP)
______ manages IP multicast groups.
1) TCP
2) ARP
3) ICMP
4) IGMP
Internet Group Management Protocol (IGMP)
In terms of the OSI model, IP is a network-layer protocol. It provides a datagram service between pplications, supporting ______
1) TCP
2) UDP
both TCP and UDP.
In terms of the OSI model, IP is a ________ layer protocol.
1) Physical layer
2) Data link layer
3) Network Layer
4) Transport layer
Network Layer
________ provides a one-to-one, connection-oriented, reliable communications service.
1) TCP
2) UDP
TCP
_____provides a one-to-one or one-to-many, connectionless, unreliable communications service
1) TCP
2) UDP
UDP
TCP/IP internet layer protocol(s)
1) ARP
2) ATM
3) SNMP
4) ICMP
ARP and ICMP
ATM - network interface layer
SNMP - Application layer
TCP/IP transport layer protocol(s)
1) ARP
2) UDP
3) TCP
4) DNS
UDP and TCP
ARP - internet layer
DNS - Application layer
TCP/IP net work interface layer protocol(s)
1) RIP
2) Ethernet
3) Frame relay
4) IGMP
Ethernet and frame relay
RIP - Application layer
IGMP - internet layer
TCP/IP application layer protocol(s)
1) SNMP
2) HTTP
3) IGMP
4) ATM
SNMP and HTTP
IGMP - internet layer
ATM - network interface layer
_______ retransmits lost data
1) TCP
2) UDP
TCP only
_______ is/are a connectionless
1) TCP
2) UDP
3) IP
UDP and IP
port number 80 for
1) HTTP
2) SMTP
3) FTP
4) SFTP
HTTP
The Well Known Ports are those in the range _____
1) 0 - 255
2) 0 - 511
3) 0- 1023
0- 1023
The Well Known Ports are assigned by the IANA (Internet Assigned Numbers Authority) for major protocols.
The Well Known Ports are assigned by
1) ISO
2) IANA
3) ITU
4) ICANN
IANA (Internet Assigned Numbers Authority) for major protocols.
The Registered Ports are those in the range
1) 1024-2047
2) 1024- 49151
3) 49152 - 65535
4) 1024 - 65535
1024 - 49151
The Private Ports are those in the range
1) 1024-2047
2) 1024- 49151
3) 49152 - 65535
4) 1024 - 65535
49152 - 65535
port number 20 for
1) HTTP
2) SMTP
3) FTP
4) SFTP
20 - FTP data
21 - FTP control
port number 25 for
1) HTTP
2) SMTP
3) FTP
4) SFTP
SMTP
Simple Mail Transfer Protocol
TCP allows
1) a record-oriented
2) a block transfer
3) an image transfer
all of these
record oriented transfer(one record at a time) ,
block transfer (which moves chunks of a file)
image transfer (which does not look in any way at the file contents).
TELNET data is
1) encrypted and safe
2) not encrypted and unsafe
not encrypted and unsafe
- use Putty to connect via SSH
MIME stands for
Multipurpose Internet Mail Extensions
