Networking

Question 1

What is a non-ephemeral port and what is their range?

Answer 1

permanent port numbers. Ports 0 - 1,023. usually on a server or service

Question 2

Define ephemeral ports and their port number range?

Answer 2

A temporary port number used by the client. Using ports 1,024 - 65,535. Determined in real time by the client

Question 3

what are the common uses of a repeater?

Answer 3

boost copper or fiber connections. Convert one network media to another. extend wireless network reach

Question 4

what is a bridge ?

Answer 4

a switch with two to four ports - makes forwarding decisions in software. Distributes traffic based on MAC address and connects different LANs

Question 5

what is an unmanaged switch ?

Answer 5

switch with basic functionality. Very few config options - plug and play

Question 6

what is a managed switch ?

Answer 6

more functionality. configure different VLANS on different interfaces. Traffic prioritization. Redundancy support using STP. External Mgmt with SNMP. Port mirroring -capture packets

Question 7

a Wireless Access Point (WAP) acts as a _____

Answer 7

Bridge . it extends the wired network onto the wireless network and makes forwarding decisions based on MAC address

Question 8

organizations use _______ for centralized management of their WAPs

Answer 8

Wireless LAN controller

Question 9

______ are used to filter traffic by port number

Answer 9

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

Question 10

A _____ modem uses telephone lines to transfer data

Answer 10

DSL. Download speed is faster than upload speed making it a - symmetric. 52 mbit/s downstream / 16 mbit/s upstream are common

Question 11

_________ is when you provide ethernet capability over a power line

Answer 11

ethernet over power (EOP) also called power-line communication (PLC). 500 megabits per second

Question 12

How can we add devices to the network that is out of available addresses using IPV4?

Answer 12

Network Address Translation (NAT)

Question 13

Configuring NAT on a SOHO device uses ______

Answer 13

Source NAT or PAT (Port Address Translation) - all internal devices are translated to a single external address

Question 14

how to configure an internal device so it is accessible externally?

Answer 14

Port Forwarding / Destination NAT or Static NAT

Question 15

____ Allows network devices to automatically configure and find other network devices. Applications on the internal network can open inbound ports

Answer 15

Universal Plug and Play (UPnP)

Question 16

APIPA stands for…

Answer 16

Automatic Private IP Address

Question 17

QoS (Quality of service) allows you to ____

Answer 17

gives control on network bandwidth by many different criteria

Question 18

Link Layer Discovery Protocol (LLDP) and Universal Plug n Play (UPnP) help with _____

Answer 18

network device identification

Question 19

Simple Network Management Protocol enables _______

Answer 19

querying of network devices how much bandwidth is going through a switch or what a routers firewall is filtering

Question 20

The difference between a managed switch and an unmanaged switch is that the_____

Answer 20

managed switch includes the capability for an interface to control settings such as VLAN

Question 21

if you plug devices into a switch and their not seeing each other there is a good chance ______

Answer 21

there is a VLAN issue

Question 22

802.11a operates at _____ ghz with ___ MIMO streams and has a theoretical maximum throughput of _____

Answer 22

5ghz. n/a. 54 mbit/s (actual throughput is no more than 25 Mbps)

Question 23

802.11b operates at ____ ghz with ___ MIMO streams and has a theoretical max throughput of _____ .

Answer 23

2.4ghz. n/a. 11 mbit/s (with actual througput averaging 4-6 Mbps)

Question 24

802.11g operates at ____ ghz with ____ MIMO streams and has a theoretical max throughput of _____ mbit/s.

Answer 24

2.4ghz. n/a. 54 mbit/s

Question 25

802.11n operates at ____ ghz with ___ MIMO streams and has a max theoretical throughput of ____ per stream and ____ total

Answer 25

2.4ghz/5ghz. 4 MIMO. 150 mbit/s (realistically 100+ mbps at 300ft) and 600 mbit/s

Question 26

802.11ac operates at ___ ghz with ____ MU-MIMO streams and has a max theoretical throughput of ____ per stream and ____ total

Answer 26

5ghz. 8 MU-MIMO.866.7 mbit/s and

about 6.8gbit/s.

Question 27

Most mobile device’s NIC is configured as ____

Answer 27

DHCP server

Question 28

Bluetooth differs from 802.11 in that it is meant to connect only ____ devices creating a _____

Answer 28

Two. Personal Area Network (PAN)

Question 29

The first response to troubleshooting a “no connection” issue _____

Answer 29

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

Question 30

troubleshooting a low RF signal

Answer 30

either get closer to the SSID or check the antennas orientation as it may reduce speed or range

Question 31

What is the most common cause for intermittent connectivity

Answer 31

low RF signal

Question 32

What is LAN ?

Answer 32

a group of computers who all share the same network ID

Question 33

What is LAN ?

Answer 33

a group of computers who all share the same network ID

Question 34

What is a WAN ?

Answer 34

two or more LAN’s connected together via one or more routers

Question 35

a metropolitan area network (MAN) is?

Answer 35

a WAN limited to a municipal area

Question 36

a PAN is?

Answer 36

a point to point connection between two bluetooth capable devices

Question 37

two or more wireless nodes communicating in ad hoc mode form whats called an _______

Answer 37

Independent Basic Service Set (IBSS)

Question 38

In a wireless mesh network (WMN) the nodes act like _____

Answer 38

routers, forwarding traffic for other nodes but without the wires

Question 39

What are 2 simple ways to secure a wireless network?

Answer 39

changing the default SSID and disabling the SSID broadcast