Networking Flashcards
What is a non-ephemeral port and what is their range?
permanent port numbers. Ports 0 - 1,023. usually on a server or service
Define ephemeral ports and their port number range?
A temporary port number used by the client. Using ports 1,024 - 65,535. Determined in real time by the client
what are the common uses of a repeater?
boost copper or fiber connections. Convert one network media to another. extend wireless network reach
what is a bridge ?
a switch with two to four ports - makes forwarding decisions in software. Distributes traffic based on MAC address and connects different LANs
what is an unmanaged switch ?
switch with basic functionality. Very few config options - plug and play
what is a managed switch ?
more functionality. configure different VLANS on different interfaces. Traffic prioritization. Redundancy support using STP. External Mgmt with SNMP. Port mirroring -capture packets
a Wireless Access Point (WAP) acts as a _____
Bridge . it extends the wired network onto the wireless network and makes forwarding decisions based on MAC address
organizations use _______ for centralized management of their WAPs
Wireless LAN controller
______ are used to filter traffic by port number
Firewalls. Traditionally filter by UDP/TCP port # known as OSI layer 4 filtering. Modern firewalls can examine everything in traffic flow including the application thats in use
A _____ modem uses telephone lines to transfer data
DSL. Download speed is faster than upload speed making it a - symmetric. 52 mbit/s downstream / 16 mbit/s upstream are common
_________ is when you provide ethernet capability over a power line
ethernet over power (EOP) also called power-line communication (PLC). 500 megabits per second
How can we add devices to the network that is out of available addresses using IPV4?
Network Address Translation (NAT)
Configuring NAT on a SOHO device uses ______
Source NAT or PAT (Port Address Translation) - all internal devices are translated to a single external address
how to configure an internal device so it is accessible externally?
Port Forwarding / Destination NAT or Static NAT
____ Allows network devices to automatically configure and find other network devices. Applications on the internal network can open inbound ports
Universal Plug and Play (UPnP)
APIPA stands for…
Automatic Private IP Address
QoS (Quality of service) allows you to ____
gives control on network bandwidth by many different criteria
Link Layer Discovery Protocol (LLDP) and Universal Plug n Play (UPnP) help with _____
network device identification
Simple Network Management Protocol enables _______
querying of network devices how much bandwidth is going through a switch or what a routers firewall is filtering
The difference between a managed switch and an unmanaged switch is that the_____
managed switch includes the capability for an interface to control settings such as VLAN
if you plug devices into a switch and their not seeing each other there is a good chance ______
there is a VLAN issue
802.11a operates at _____ ghz with ___ MIMO streams and has a theoretical maximum throughput of _____
5ghz. n/a. 54 mbit/s (actual throughput is no more than 25 Mbps)
802.11b operates at ____ ghz with ___ MIMO streams and has a theoretical max throughput of _____ .
2.4ghz. n/a. 11 mbit/s (with actual througput averaging 4-6 Mbps)
802.11g operates at ____ ghz with ____ MIMO streams and has a theoretical max throughput of _____ mbit/s.
2.4ghz. n/a. 54 mbit/s
802.11n operates at ____ ghz with ___ MIMO streams and has a max theoretical throughput of ____ per stream and ____ total
2.4ghz/5ghz. 4 MIMO. 150 mbit/s (realistically 100+ mbps at 300ft) and 600 mbit/s
802.11ac operates at ___ ghz with ____ MU-MIMO streams and has a max theoretical throughput of ____ per stream and ____ total
5ghz. 8 MU-MIMO.866.7 mbit/s and
about 6.8gbit/s.
Most mobile device’s NIC is configured as ____
DHCP server
Bluetooth differs from 802.11 in that it is meant to connect only ____ devices creating a _____
Two. Personal Area Network (PAN)
The first response to troubleshooting a “no connection” issue _____
making sure there’s a network to connect to. Has the SSID changed so ur device doesn’t recognize it or has the password changed
troubleshooting a low RF signal
either get closer to the SSID or check the antennas orientation as it may reduce speed or range
What is the most common cause for intermittent connectivity
low RF signal
What is LAN ?
a group of computers who all share the same network ID
What is LAN ?
a group of computers who all share the same network ID
What is a WAN ?
two or more LAN’s connected together via one or more routers
a metropolitan area network (MAN) is?
a WAN limited to a municipal area
a PAN is?
a point to point connection between two bluetooth capable devices
two or more wireless nodes communicating in ad hoc mode form whats called an _______
Independent Basic Service Set (IBSS)
In a wireless mesh network (WMN) the nodes act like _____
routers, forwarding traffic for other nodes but without the wires
What are 2 simple ways to secure a wireless network?
changing the default SSID and disabling the SSID broadcast
