5-A Flashcards
What is an LAN?
A local area network (LAN) is of limited use without an Internet connection.
What is the role of ISPs in Internet connectivity?
ISPs use high-speed links and transit/peering arrangements to connect local networks to the Internet.
What is a modem?
A modem establishes the physical connection to the WAN interface for Internet access.
What function does a router serve in networking?
A router identifies networks and forwards data between them using Internet Protocol (IP).
What does DSL stand for?
Digital Subscriber Line.
What is the primary function of the public switched telephone network (PSTN)?
To enable communication over both fiber optic and copper cabling.
What are the two main types of DSL?
Asymmetrical DSL (ADSL) and Symmetrical DSL.
What is ADSL known for?
Providing faster downlink speeds compared to uplink speeds.
What does VDSL stand for?
Very High-Speed Digital Subscriber Line.
What is the major disadvantage of satellite Internet?
Increased latency due to the distance signals must travel.
Fill in the blank: A fiber to the ______ connection means fiber optic cable goes directly to the customer’s building.
Premises.
What does FTTC stand for?
Fiber to the Curb.
What is the typical downstream speed for VDSL over 300 meters?
52 Mbps for asymmetric and 26 Mbps for symmetric.
What does DOCSIS stand for?
Data Over Cable Service Interface Specification.
What is a WISP?
Wireless Internet Service Provider.
True or False: 5G uses a single large antenna to serve a wide area.
False.
What is the role of a firewall in networking?
To control which computers can connect to networks and filter traffic.
What type of router forwards traffic to and from the Internet?
WAN or border router.
What does the acronym ACL stand for in networking?
Access Control List.
What is a key feature of 4G and 5G networks?
They can be used for fixed-access wireless broadband solutions.
What is the typical round trip time (RTT) delay for satellite Internet?
600–800 ms.
Fill in the blank: A cable modem connects to the service provider network using a ______.
coaxial cable.
What technology is used by low Earth orbit (LEO) satellites?
Phased array technology.
What is the difference between GSM and CDMA in cellular technology?
GSM uses removable SIM cards; CDMA does not.
What type of connections do DSL modems typically use?
RJ11 and RJ45 ports.
What is the purpose of a splitter in DSL installations?
To separate voice and data signals.
What is the purpose of an Optical Network Terminal (ONT)?
To convert optical signals to electrical ones for local routing.
What is the role of a network firewall?
To filter allowed and denied hosts and protocols
A network firewall is essential in managing traffic between different network segments.
What is a network access control list (ACL)?
A set of rules configured in a firewall to determine traffic permissions
Each entry in the ACL specifies source and/or destination addresses and protocol types.
How can firewalls be deployed within a private network?
To restrict access to specific clients connecting to certain servers
This is achieved by placing servers behind a local network firewall.
What kind of functionality can most routers implement?
Basic firewall functionality
Many routers have built-in options to manage traffic rules.
What is a standalone firewall appliance?
A dedicated device that performs deeper analysis of application protocol data
These appliances use sophisticated rules to manage traffic.
What are unified threat management (UTM) appliances?
Devices that perform multiple security functions including firewall capabilities
UTM appliances integrate various security measures into one system.
What are personal or software firewalls?
Firewalls installed on a single computer to protect it from threats
Unlike network firewalls, these focus on individual device security.
What type of cable is required to connect an ADSL router’s WAN interface?
ADSL cable
This is necessary for establishing a connection to the service provider.
What type of cable is needed for a full fiber connection to an optical network terminal (ONT)?
Fiber optic cable
This cable type is essential for transmitting high-speed internet signals.
True or false? Both 4G and 5G cellular can be used for fixed access broadband as well as in mobile devices.
True
Both technologies support internet access in various forms.
True or false? A SOHO router uses an embedded modem and Ethernet adapter to forward traffic between public and private network segments over a single hardware port.
True
SOHO routers are designed for small office and home office environments.
