D315 Study Guide Questions with Verified
Correct Answers
Switch
-primary device within a network segment/LAN
-all wired devices connect to a switch port
-switch port facilitates communication between any two devices within the internal network
-forwards traffic only in correct port connected to intended recipient
-operates at layer two of the OSI model (Data Link Layer) and uses MAC addresses to make
forwarding decisions
Wireless Access Point
-bridges wireless devices onto the wired network
-single connection: where ethernet cable would be connected to switch port
-operates at layer two of the OSI model - Data Link Layer
-uses MAC addresses to know whether or not to forward the traffic from the wired to the
wireless (and vice versa)
Wireless Range Extender
repeater that listens to the wireless signal from the primary access point, then regenerates
them and sends them out to get wireless devices onto the wired network
Router
-moves data or traffic from one IP network to another
-operate on the network layer of the OSI model (third layer)
Firewall
,-primary security device on a network that filters or evaluates traffic as it either comes into or
out of network
-compares traffic against a fixed set of rules to decide what is allowed and what is
blocked/denied/discarded
Packet Filtering Firewall
-operates at layers three and four: Network and Transport
-evaluates the source and destination IP addresses of each packet and/or the port number of
each packet
DHCP Server
-service on network that listens for devices as they boot up and as devices request an IP
address in order to communicate on the network
-has a group of IP addresses that can be passed out to each device on a temp basis
Modem
-facilitate communication to internet through internet service provider/ ISP
-operate at level one (Physical Layer) of OSI model
Twisted Pair Cabling
-aka Ethernet Cabling
- Two Varieties: UTP (unshielded twisted pair) and STP (shielded twisted pair)
-eight wires
-twisting ensures cancellation of interference and gives better quality signal
-
Personal Area Network
,-PAN
-network of all personal devices
-close proximity, using bluetooth
Local Area Network
-LAN
-two kinds: SOHO (small office, home office) and larger business (diff: SOHO uses all-in-
one)
-private networks
-all within same building
Campus Area Network
-CAN
-multiple buildings
Metropolitan Area Network
-MAN
-town or municipality or city
-uses IEEE 802.11 networking standards for better performance and increased bandwidth
Wide Area Network
-WAN
-spread out
-everything is over public network and internet links
Storage Area Network
, -SAN
-separated network just for SAN
-stores IP based storage devices without impeding on other devices communicating on a
network
-connected to other network via server(s)
Bus Topology
-no central device, no hub or switch
-has center trunk cable
-single point of failure: break anywhere in trunk cable meant the entire network was
unavailable
-terminating resistor on both sides: device that absorbed electric signal
-device sends message -- puts electric signal on copper cable
-every device gets message
-two devices send signal at same time: cause collision and corrupt data
Ring Topology
-no central device
-direct connections to neighboring devices
-two network interface cards with direct connection to two different neighbors and all
connections formed a loop
-single point of failure: break anywhere between two devices meant entire network was
unavailable
-slightly more efficient than Bus
-message sent from one device to next until destination is reached
Star Topology
Correct Answers
Switch
-primary device within a network segment/LAN
-all wired devices connect to a switch port
-switch port facilitates communication between any two devices within the internal network
-forwards traffic only in correct port connected to intended recipient
-operates at layer two of the OSI model (Data Link Layer) and uses MAC addresses to make
forwarding decisions
Wireless Access Point
-bridges wireless devices onto the wired network
-single connection: where ethernet cable would be connected to switch port
-operates at layer two of the OSI model - Data Link Layer
-uses MAC addresses to know whether or not to forward the traffic from the wired to the
wireless (and vice versa)
Wireless Range Extender
repeater that listens to the wireless signal from the primary access point, then regenerates
them and sends them out to get wireless devices onto the wired network
Router
-moves data or traffic from one IP network to another
-operate on the network layer of the OSI model (third layer)
Firewall
,-primary security device on a network that filters or evaluates traffic as it either comes into or
out of network
-compares traffic against a fixed set of rules to decide what is allowed and what is
blocked/denied/discarded
Packet Filtering Firewall
-operates at layers three and four: Network and Transport
-evaluates the source and destination IP addresses of each packet and/or the port number of
each packet
DHCP Server
-service on network that listens for devices as they boot up and as devices request an IP
address in order to communicate on the network
-has a group of IP addresses that can be passed out to each device on a temp basis
Modem
-facilitate communication to internet through internet service provider/ ISP
-operate at level one (Physical Layer) of OSI model
Twisted Pair Cabling
-aka Ethernet Cabling
- Two Varieties: UTP (unshielded twisted pair) and STP (shielded twisted pair)
-eight wires
-twisting ensures cancellation of interference and gives better quality signal
-
Personal Area Network
,-PAN
-network of all personal devices
-close proximity, using bluetooth
Local Area Network
-LAN
-two kinds: SOHO (small office, home office) and larger business (diff: SOHO uses all-in-
one)
-private networks
-all within same building
Campus Area Network
-CAN
-multiple buildings
Metropolitan Area Network
-MAN
-town or municipality or city
-uses IEEE 802.11 networking standards for better performance and increased bandwidth
Wide Area Network
-WAN
-spread out
-everything is over public network and internet links
Storage Area Network
, -SAN
-separated network just for SAN
-stores IP based storage devices without impeding on other devices communicating on a
network
-connected to other network via server(s)
Bus Topology
-no central device, no hub or switch
-has center trunk cable
-single point of failure: break anywhere in trunk cable meant the entire network was
unavailable
-terminating resistor on both sides: device that absorbed electric signal
-device sends message -- puts electric signal on copper cable
-every device gets message
-two devices send signal at same time: cause collision and corrupt data
Ring Topology
-no central device
-direct connections to neighboring devices
-two network interface cards with direct connection to two different neighbors and all
connections formed a loop
-single point of failure: break anywhere between two devices meant entire network was
unavailable
-slightly more efficient than Bus
-message sent from one device to next until destination is reached
Star Topology
