CCNA 200-125 Exam: Wireless Questions With Answers

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  1. Which device allows users to connect to the network using a single or double radio?
    • A. access point*
    • B. switch
    • C. wireless controller
    • D. firewall

    Show (Hide) Explanation/Reference
    Many Cisco access points offer single or double (dual) radio (2.4 and 5.0 GHz).

    Note: The wireless controller automates wireless configuration and management functions. It does not connect directly to users.

  2. Which two statements about wireless LAN controllers are true? (Choose two)
    • A. They can simplify the management and deployment of wireless LANs.*
    • B. They rely on external firewalls for WLAN security.
    • C. They are best suited to smaller wireless networks.
    • D. They must be configured through a GUI over HTTP or HTTPS.
    • E. They can manage mobility policies at a systemwide level.*

    Show (Hide) Explanation/Reference
    Cisco Wireless is designed to provide 802.11 wireless networking solutions for enterprises and service providers. Cisco Wireless simplifies deploying and managing large-scale wireless LANs and enables a unique best-in-class security infrastructure. The operating system manages all data client, communications, and system administration functions, performs radio resource management (RRM) functions, manages system-wide mobility policies using the operating system security solution, and coordinates all security functions using the operating system security framework.

    Reference: http://www.cisco.com/c/en/us/td/docs/wireless/controller/8-2/config-guide/b_cg82/b_cg82_chapter_01.html

  3. Which WAN topology is most appropriate for a centrally located server farm with several satellite branches?
    • A. star
    • B. hub and spoke*
    • C. point-to-point
    • D. full mesh

    Show (Hide) Explanation/Reference
    Star is the most popular topology for Ethernet topology but hub and spoke is the most appropriate WAN topology.

    In a Hub-and-spoke network topology, one physical site act as Hub (Example, Main Office or Head Quarter), while other physical sites act as spokes. Spoke sites are connected to each other via Hub site. In Hub-and-spoke topology, the network communication between two spokes always travel through the hub (except when using DMVPN Phase II or Phase III where spokes can communicate with each other directly). The networking device at Hub site is often much more powerful than the ones at spoke sites.

    Hub and spoke is an ideal topology when most of the resources lie at the Hub site and the branch sites only need to access to the Hub.

    Note: Although some books may say Hub-and-spoke and Star topologies are the same but in fact they have difference. When talking about Hub-and-spoke we often think about the communication between Hub site and Spoke sites. When talking about Star we think about the communication between end devices.

  4. What are three broadband wireless technologies? (Choose three)
    • A. WiMax*
    • B. satellite Internet*
    • C. municipal Wi-Fi*
    • D. site-to-site VPN
    • E. DSLAM
    • F. CMTS

    Show (Hide) Explanation/Reference
    WiMAX is short for Worldwide Interoperability for Microwave Access. WiMAX is a family of wireless communication standards based on the IEEE 802.16 set of standards.

    Satellite Internet provides Internet access via satellite. It is a form of wireless broadband technology. But it is usually slower than DSL and cable modem.

    Municipal wireless network is a city-wide wireless network. This is usually done by providing municipal broadband via Wi-Fi to large parts or all of a municipal area by deploying a wireless mesh network. The typical deployment design uses hundreds of wireless access points deployed outdoors, often on poles.

    DSLAM (Digital Subscriber Line Access Multiplexer) is a network device, usually at a telephone company central office, that receives signals from multiple customer Digital Subscriber Line (DSL) connections and puts the signals on a high-speed backbone line using multiplexing techniques. It is a cable technology, not a wireless technology.

    Cable Modem Termination Systems (CMTS) is a piece of equipment, typically located in a cable company’s headend or hubsite, which is used to provide high speed data services, such as cable Internet or Voice over Internet Protocol, to cable subscribers. It is a cable technology, not a wireless technology.

  5. What are three characteristics of satellite Internet connections? (Choose three)
    • A. Their upload speed is about 10 percent of their download speed.*
    • B. They are frequently used by rural users without access to other high-speed connections.*
    • C. They are usually at least 10 times faster than analog modem connections.*
    • D. They are usually faster than cable and DSL connections.
    • E. They require a WiMax tower within 30 miles of the user location.
    • F. They use radio waves to communicate with cellular phone towers.

    Show (Hide) Explanation/Reference
    Many rural areas do not have cable Internet access and their only choice to connect to the Internet is via satellite. Satellite internet leverages the hundreds of satellites in orbit around the Earth to send and receive data over the Internet. Of course the speed of this type of connection is much slower than DSL and cable connections. But with new technologies, satellite connections may achieve data speed up to 50 Mbps -> B is correct, D is not correct.

    In general, the speeds of popular types of Internet connections are like this: DSL/cable > satellite Internet > dial-up (analog modem).

    Satellite Internet uses satellite for Internet connection -> E is not correct

    Satellites use radio waves to communicate with the customer’s gateway, also known as a ground station (like a customer’s satellite dish), but not with cellular phone towers -> F is not correct.

    For your information, satellite Internet uses high frequency signals, which range from 18.3 gigahertz to 31 gigahertz (Ka band).

    Answer A C are two options left and they are acceptable answers. Although in practical they may vary a lot.

  6. Which Cisco platform can verify ACLs?
    • A. Cisco Prime Infrastructure
    • B. Cisco Wireless LAN Controller
    • C. Cisco APIC-EM*
    • D. Cisco IOS-XE

    Show (Hide) Explanation/Reference
    The APIC-EM Path Trace ACL Analysis Tool can display the ACLs that are using (by downloading the configurations after a specific period of time and shows them when we do a path trace). Therefore it helps verify the ACLs more easily.

  7. What happens when an 802.11a node broadcasts within the range of an 802.11g access point?
    • A. The access point transmits, but the node is unable to receive.
    • B. A connection occurs.
    • C. Both the node and the access point are unable to transmit.
    • D. The node transmits, but the access point is unable to receive.*

    Show (Hide) Explanation/Reference
    802.11g is only compatible with 802.11b, not 802.11a so when 802.11a node broadcast, 802.11g access point cannot receive it.
  8. Which two statements about access points are true? (Choose two)
    • A. They can provide access within enterprises and to the public.
    • B. In most cases, they are physically connected to other network devices to provide network connectivity.*
    • C. They can protect a network from internal and external threats.
    • D. Most access points provide Wi-Fi and Bluetooth connectivity.*
    • E. They must be hardwired to a modem.

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