CMIS 468 Exam 1 Questions With
Complete Answers
What are the 5 layers? - ANSWER 5. application
4. transport
3. internet
2. data link
1. physical
What are the functions of layer 5? - ANSWER end-user applications
What are the functions of layer 4? - ANSWER reliability and flow control
What are the functions of layer 3? - ANSWER logical addressing and path
determination
What are the functions of layer 2? - ANSWER physical addressing
What are the functions of layer 1? - ANSWER signaling
What are some example of layer 5? - ANSWER email, file transfer, Netflix
What are some examples of layer 4? - ANSWER ports and reliability
What are some examples of layer 3? - ANSWER IP addresses, routing, ping
What are some examples of layer 2? - ANSWER switching, ethernet, frame relay,
MAC
What are some examples of layer 1? - ANSWER twisted pair, fiber, wireless
What are the different types of hosts? - ANSWER client and server hosts
client host - ANSWER mobile phones, tablets, PCs, etc.
server host - ANSWER rack servers
circuit switching - ANSWER method of implementing a telecom network in which
two network nodes establish a dedicated communications network through the
network before the nodes may communicate
, packet switching - ANSWER mode of data transmission in which a message is
broken down into a number of parts that are sent independently, over whatever
route is optimum for each packet, and reassembled at the destination
physical links - ANSWER connections between adjacent pairs of devices
data links - ANSWER transmission links that carry packets between pairs of
routers
route - ANSWER the path that a packet takes across an internet
TCP/IP - ANSWER the internet engineering tasks force's standards architecture;
dominant above the data link layer
What is the relationship between ISPs and NAPs? - ANSWER The NAP is a public
network exchange facility where ISPs connect with one another
Dynamic Host Configuration Protocol (DHCP) - ANSWER provide each user PC
with a temporary IP address to use each time he or she connects to the internet
What five pieces of information does DHCP provide? - ANSWER - IP address
- subnet mask
- gateway IP address
- DNS server IP address
- lease time
Domain Name System (DNS) - ANSWER a server that provides IP addresses for
users who know only a target host's host name; also provide a hierarchical
system for naming domains
Local Area Network (LAN) - ANSWER a network within a customer's premises
Wide Area Network(WAN) - ANSWER a network that links different sites together
Network Access Translation (NAT) - ANSWER converting an IP address into
another IP address, usually at a border firewall; disguises a host's true IP
address from sniffers; allows more internal addresses to be used than an ISP
supplies a firm with external addresses
What does a router do? - ANSWER separates a LAN from a WAN
What do networking standards do? - ANSWER govern the exchange of
messages between hardware and software processes on different hosts
octet - ANSWER a collection of 8 bits; same as a byte
Complete Answers
What are the 5 layers? - ANSWER 5. application
4. transport
3. internet
2. data link
1. physical
What are the functions of layer 5? - ANSWER end-user applications
What are the functions of layer 4? - ANSWER reliability and flow control
What are the functions of layer 3? - ANSWER logical addressing and path
determination
What are the functions of layer 2? - ANSWER physical addressing
What are the functions of layer 1? - ANSWER signaling
What are some example of layer 5? - ANSWER email, file transfer, Netflix
What are some examples of layer 4? - ANSWER ports and reliability
What are some examples of layer 3? - ANSWER IP addresses, routing, ping
What are some examples of layer 2? - ANSWER switching, ethernet, frame relay,
MAC
What are some examples of layer 1? - ANSWER twisted pair, fiber, wireless
What are the different types of hosts? - ANSWER client and server hosts
client host - ANSWER mobile phones, tablets, PCs, etc.
server host - ANSWER rack servers
circuit switching - ANSWER method of implementing a telecom network in which
two network nodes establish a dedicated communications network through the
network before the nodes may communicate
, packet switching - ANSWER mode of data transmission in which a message is
broken down into a number of parts that are sent independently, over whatever
route is optimum for each packet, and reassembled at the destination
physical links - ANSWER connections between adjacent pairs of devices
data links - ANSWER transmission links that carry packets between pairs of
routers
route - ANSWER the path that a packet takes across an internet
TCP/IP - ANSWER the internet engineering tasks force's standards architecture;
dominant above the data link layer
What is the relationship between ISPs and NAPs? - ANSWER The NAP is a public
network exchange facility where ISPs connect with one another
Dynamic Host Configuration Protocol (DHCP) - ANSWER provide each user PC
with a temporary IP address to use each time he or she connects to the internet
What five pieces of information does DHCP provide? - ANSWER - IP address
- subnet mask
- gateway IP address
- DNS server IP address
- lease time
Domain Name System (DNS) - ANSWER a server that provides IP addresses for
users who know only a target host's host name; also provide a hierarchical
system for naming domains
Local Area Network (LAN) - ANSWER a network within a customer's premises
Wide Area Network(WAN) - ANSWER a network that links different sites together
Network Access Translation (NAT) - ANSWER converting an IP address into
another IP address, usually at a border firewall; disguises a host's true IP
address from sniffers; allows more internal addresses to be used than an ISP
supplies a firm with external addresses
What does a router do? - ANSWER separates a LAN from a WAN
What do networking standards do? - ANSWER govern the exchange of
messages between hardware and software processes on different hosts
octet - ANSWER a collection of 8 bits; same as a byte
