WAN Flashcards
Which of the following WAN technologies would MOST likely be used to connect several remote branches that have no fiber, microwave, or satellite connections available?
POTS (Plain Old Telephone System) is connected to almost every facility in the United States. DSL and dial-up services can be received over POTS.
WiMAX is a type of microwave connection. Starlink is a type of satellite connection.
What is WiMAX?
WiMAX is a type of microwave connection.
What is starlink?
Starlink is a type of satellite connection.
Which of the following devices does a CSU/DSU connect?
A channel service unit/data service unit (CSU/DSU) device is designed to connect a terminal device (DTE – ex. router) to a T1 line.
A CSU/DSU (Channel Service Unit/Data Service Unit) is a hardware device that converts digital data frames from the communications technology used on a local area network (LAN) into frames appropriate to a wide-area network (WAN) and vice versa.
Which WAN technology relies on virtual circuits and point-to-multipoint connections?
Frame Relay is a WAN technology that specifies the physical and data link layers of digital telecommunications channels using a packet switching methodology.
It supports the use of virtual circuits and point-to-multipoint connections. It is commonly used to connect multiple smaller corporate office locations back to a larger centralized headquarters.
MPLS and ISDN use point-to-point connections, not point-to-multipoint connections.
Which of the following is often used to allow one node to communicate with many other nodes, such as in DMVPN connections?
Multipoint GRE (mGRE) is a protocol that can be used to enable one node to communicate with many nodes by encapsulating layer 3 protocols to create tunnels over another network. The mGRE protocol is often used in Dynamic Multipoint VPN (DMVPN) connections.
Which of the following technologies allows a network to be abstracted from the physical hardware by creating a virtualized network overlay?
A software-defined wide area network (SDWAN) is a network that is abstracted from its hardware which creates a virtualized network overlay.
You have been asked to select a connection for a branch office. Which type of line should you use if one of the requirements is for the connection to have a speed of 1.544 Mbps?
A T1 is a dedicated leased line that offers a speed of 1.544 Mbps.
A T3 is a dedicated leased line that offers a speed of 44.736 Mbps.
An E1, commonly used in European Countries, offers a speed of 2.048 Mbps.
You are purchasing a connection for a branch office in a European country. Which type of line should you use if you want the connection to support speeds of 2.048 Mbps?
An E1 is similar to a T1 line, but is used in European countries. E1 lines offer a speed of 2.048 Mbps.
An E3 is a dedicated leased line that offers a speed of 34.268 Mbps.
Elon, a network technician, has been asked to purchase an internet connection for a small business network. Which of the following internet access technologies could Elon purchase for the business?
Cable Broadband and Digital Subscriber Line (DSL) are 2 options that are affordable and reliable for small business use.
Fiber is a great option, but is more expensive than Cable or DSL, making it not the best choice. Dial-Up isn’t commonly used nowadays due to its slow speeds and low reliability.
Which type of internet access technologies can be used in places such as rural areas, but has a high latency?
Satellite internet is common among rural areas that don’t have access to high-speed broadband internet. The main drawback with satellite is the high amount of latency associated with it.
Dial-Up isn’t commonly used nowadays due to its slow speeds and low reliability.
Cable Broadband is ubiquitous but isn’t available in most places, such as rural areas. Cable internet also doesn’t have a high latency associated with it.
T1 lines are generally expensive despite the low speeds offered. T1 lines don’t have a high latency.
A CEO wants to interconnect all of the local offices in the city to be able to share information. He wants fast connectivity and redundancy. Which of the following service types should be used in this situation?
MetroE (Metro Ethernet) is a connectivity option that allows you to connect offices within a metropolitan area at high speeds using fiber links.
Frame Relay is a WAN (Wide Area Network), not MAN (Metropolitan Area Network) technology, and is being phased out by MPLS (Multi Protocol Label Switching).
Fiber is what is used to carry connect the infrastructure, not the type of service itself. Cable Broadband is better suited for SOHO (Small Office Home Office) networks.
Which type of encapsulation is used between DSL clients and the service provider to support features such as authentication with Ethernet?
PPPoE (Point to Point Protocol over Ethernet) provides features such as authentication over Ethernet networks, which is useful for ISPs (Internet Service Providers).
PPP (Point to Point Protocol) provides the features that PPPoE uses, but only for serial links.
ATM (Asynchronous Transfer Mode) is a technology used by service providers to switch data using fixed cells of 53 bytes.
MPLS (Multi Protocol Label Switching) is a Service Provider technology used to switch data based on labels, instead of addresses.
Which cellular technology is widely used around the world?
GSM (Global System for Mobile Communications) is a popular cellular technology used widely around the world.
CMDA is another widely used cellular technology, but it isn’t as popular around the world and is typically used in North American countries.
A SIM (Subscriber Identity Module) is an integrated circuit used to uniquely identify and authenticate a phone into a provider’s network.
TDMA (Time Division Multiple Access) is a channel access method used to multiplex sessions through time slots allowing multiple streams of data to be carried at once.
Which of the following switching types establishes a virtual circuit? (007)
Packet switched networks establish a virtual circuit between two endpoints, as there isn’t a physical circuit like there is with circuit-switched networks. Modern networks use packet switched techniques.
Circuit Switched networks have a dedicated physical circuit with dedicated bandwidth.
Fast Switching and Process switching are forms of packet and frame forwarding techniques done on infrastructure devices.
