Exam 3
When using RFID, what is an ARPT (Active Reader Passive Tag)?
It is a tag that is activated by an active reader, and uses power from the reader's radio to power its transmission.
When an 802.1Q tag is added to an Ethernet frame, where is it placed?
It is inserted between the source address and the Ethernet type field.
In a public switched telephone network, what portion of the network is known as the local loop?
It is the portion that connects any residence or business to the nearest central office.
What is a data-link connection identifier (DLCI) utilized for?
It is used by routers to determine which circuit to forward a frame to in a frame relay network.
What is the purpose of the Layer 2 LLC sublayer?
It is used to handle multiplexing, flow and error control, and reliability.
A subnet of 255.255.248.0 can be represented by what CIDR notation?
/21
You have been tasked with the creation and design of a network that must support a minimum of 5000 hosts. Which network accomplishes this goal?
10.3.0.0/19
On a Cisco switch, what would the security association identifier be for VLAN 13?
100013
A network with 10 bits remaining for the host portion will have how many usable host addresses?
1022
Near-field communication devices send data at what fixed frequency?
13.56 MHz
Given a host IP address of 172.16.1.154 and a subnet mask of 255.255.254.0, what is the network ID for this host?
172.16.0.0
An IP address of 192.168.18.73/28 has what network ID?
192.168.18.64
In an 802.11 data frame, what is the maximum amount of data that can be sent?
2312 bytes
By default, when using classful addressing, how many bits exist in the host portion of a Class A address?
24
Multiplexing enables a single T1 circuit to carry how many channels?
24
How many transponders are contained within a typical satellite?
24 to 32
What subnet mask can be used to segment the 172.16.0.0 network to allow for a minimum of 6 subnets while maximizing the number of hosts per subnet?
255.255.224.0
A network with a CIDR notation of /26 would have what subnet mask?
255.255.255.192
How many /64 subnets can be created within a /56 prefix?
256
The C-Band utilized by satellites consists of what frequency range?
3.4 - 6.7 GHz
802.11ac Wave 2 devices can theoretically support how much maximum throughput?
3.47 gbps
When using DOCSIS 3.0, what is the minimum number of channels that can be used?
4
How large is the 802.1Q tag that is added to an Ethernet frame when using VLANs?
4 bytes
How many data streams are used in 802.11ac Wave 2 devices?
4 data streams
What is the maximum throughput of a DS3 connection?
44.736 Mbps
What is the size of an ATM cell, including the header?
53 bytes
In an 802.11 data frame, what is the size of the frame check sequence field?
6 bytes
A fractional T1's bandwidth can be leased multiples of what data rate?
64 Kbps
In an ISDN connection, what amount of throughput did a single B channel provide?
64 Kbps
What is the maximum number of host IP addresses that can exist in a Class B network?
65,534
How many subnets can a /48 site prefix support?
65,536 subnets
Which of the following statements regarding the 802.11ac standard is NOT accurate?
802.11ac access points function more like a hub than a switch.
What IEEE standard specifies how VLAN information appears in frames and how switches interpret that information?
802.1Q
The wireless spectrum, as defined by the FCC, spans between which two frequencies?
9 kHz and 300 GHz
Which of the following is NOT a task that a VPN concentrator is responsible for?
A VPN concentrator shuts down established connections with malicious traffic occurs.
What type of scenario would be best served by using a Platform as a Service (PaaS) cloud model?
A group of developers needs access to multiple operating systems and the runtime libraries that the OS provides.
What scenario describes an evil twin attack?
A malicious access point is configured with the SSID of a non-malicious public access point.
The 802.11 standard specifies the use of what technique in order to minimize the potential for collisions?
Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
Amazon and Rackspace both utilize what virtualization software below to create their cloud environments?
Citrix Xen
Which of the following virtualization products is an example of a bare-metal hypervisor?
Citrix XenServer
Which Bluetooth power class allows for a maximum power output of 100 mW and a range of up to 100 m?
Class 1
Which of the following suggestions can help prevent VLAN hopping attacks on a network?
Disable auto trunking and move native VLANs to unused VLANs.
What special enterprise VPN supported by Cisco devices creates VPN tunnels between branch locations as needed rather than requiring constant, static tunnels?
Dynamic Multipoint VPN
The PPP headers and trailers used to create a PPP frame that encapsulates Network layer packets vary between 8 and 10 bytes in size due to what field?
FCS
VMware Player and Linux KVM are both examples of what type of hypervisor?
Type 2 hypervisor
When dealing with a Cisco switch, what is NOT one of the pre-established VLANs?
VLAN 1001
Regarding VNC (Virtual Network Computing or Virtual Network Connection), what statement is accurate?
VNC is open source, allowing companies to develop their own software based on VNC.
When using a site-to-site VPN, what type of device sits at the edge of the LAN and establishes the connection between sites?
VPN gateway
What is NOT a potential disadvantage of utilizing virtualization?
Virtualization software increases the complexity of backups, making creation of usable backups difficult.
When is it appropriate to utilize the NAT network connection type?
Whenever the VM does not need to be access at a known address by other network nodes.
If you need to evaluate Wi-Fi network availability as well as optimize Wi-Fi signal settings and identify security threats, what tool should you use?
Wi-Fi analyzer
Where are MPLS labels placed within a frame?
between the layer 2 header and the layer 3 header
What is NOT one of the ways in which networks are commonly segmented?
by device manufacturer
Upon connecting to a Wi-Fi network, you're redirected to a login screen and a request to accept terms of service before being connected. What is this an example of?
captive portal
Which 802.11 frame type is related to medium access and data delivery, and includes ACK and RTS/CTS frames?
control frames
The use of multiple antennas on an access point to issue a signal to one or more receivers is enabled by what 802.11 innovation?
multiple input-multiple output (MIMO)
What term is used to describe a space that is rented at a data center facility by a service provider?
point of presence (PoP)
A wireless node that is in active scanning mode transmits what special type of frame in order to find available access points?
probe frame
The use of certificate authorities to associate public keys with certain users is known by what term?
public-key infrastructure
Which of the following terms is commonly used to describe a VLAN configuration in which one router connects to a switch that supports multiple VLANs?
router-on-a-stick
What command will set the native VLAN on a Juniper switch port?
set native-vlan-id
You are working on a Cisco switch and need to learn what VLANs exist on the switch. Which command will list the current VLANs recognized by the switch?
show vlan
What type of device can be used to assess the quality of a wireless signal?
spectrum analyzer
In order to generate a public and private key for use with SSH, what command line utility should you use?
ssh-keygen
What type of virtual circuit allows connections to be established when parties need to transmit, then terminated after the transmission is complete?
switched virtual circuit (SVC)
The Global System for Mobile Communications (GSM) utilizes what technology to create timeslots on a channel?
time division multiple access (TDMA)
The T-carrier standards, also called T-CXR standards, utilize what type of multiplexing over two wire pairs to create multiple channels?
time division multiplexing (TDM)
Why is the telnet utility a poor choice for remote access to a device?
It provides poor authentication and no encryption.
What does the VLAN Trunk Protocol (VTP) do?
It shares VLAN database information amongst switches that participate.
A vSwitch (virtual switch) or bridge is a logically defined device that operates at what layer of the OSI model?
Layer 2
How does the 802.11 data frame indicate how a large packet should be fragmented?
The sequence control field indicates how packets will be subdivided.
In metro settings, end-to-end, carrier-grade Ethernet networks can be established via what protocol?
Carrier Ethernet Transport
When using IPv6, what would a /64 network likely be assigned to?
A smaller organization or business.
Of all the DSL standards, which is the most commonly in use today?
ADSL
Which statement regarding the Asynchronous Transfer Mode (ATM) technology is accurate?
ATM can provide 4 levels of QoS, from best effort delivery to guaranteed, real-time transmission.
When troubleshooting wireless issues, what statement is accurate?
Access points that use overlapping channels can cause interference with each other if they are too close.
In North America, what ISDN connection type used two B channels and one D channel?
Basic Rate Interface (BRI)
The DTE or endpoint device for a leased line is known as which device below?
CSU/DSU
Which statement regarding the use of cable modems is NOT accurate?
Cable modems only operate at the Physical layer of the OSI model.
Which statement regarding the IKEv2 tunneling protocol is accurate?
IKEv2 offers fast throughput and good stability when moving between wireless hotspots.
What security encryption protocol requires regular re-establishment of a connection and can be used with any type of TCP/IP transmission?
IPsec
Which type of cloud service model involves hardware services that are provided virtually, including network infrastructure devices such as virtual servers?
IaaS
When using public and private keys to connect to an SSH server from a Linux device, where must your public key be placed before you can connect?
In an authorization file on the host where the SSH server is.
How does refraction affect the propagation of a wireless transmission?
It distorts the signal as it travels into and through a different transmission medium.
By default, what network connection type is selected when creating a VM in VMware, VirtualBox, or KVM?
NAT mode
At what layer of the OSI model does the IPsec encryption protocol operate?
Network layer
Which SONET OC level is a popular choice for large businesses, and is equivalent to 100 T1s?
OC-3
What OC level is primarily used as a regional ISP backbone, and occasionally by very large hospitals, universities, or other major enterprises?
OC-48
With VTP, where is the VLAN database stored?
On the switch that is known as the stack master.
What open-source VPN protocol utilizes OpenSSL for encryption and has the ability to possibly cross firewalls where IPsec might be blocked?
OpenVPN
Which of the following statements regarding the Point-to-Point (PPP) protocol is NOT accurate?
PPP can support strong encryption, such as AH or ESP.
At what layer of the OSI model do the 802.11 standards vary?
Physical layer
What optional protocol can be used in 802.11 to reserve the medium for one node's use?
RTS/CTS (Request to Send/Clear to Send)
In a software defined network, what is responsible for controlling the flow of data?
SDN controller
Which type of DSL technology has equal download and upload speeds maxing out at around 2 Mbps?
SDSL
Which of the following Layer 1 WAN technologies is not normally used as last mile service, but rather traverses multiple ISP networks, connecting these networks to the Internet backbone?
SONET (Synchronous Optical Network)
What statement regarding the SSH (Secure Shell) collection of protocols is accurate?
SSH supports port forwarding.
What cloud service model involves providing applications through an online user interface, providing for compatibility with a multitude of different operating systems and devices?
SaaS
When using satellite services for your WAN connection, what statement is accurate?
Satellite services suffer more latency and jitter issues.q
On an ATM network, how is the path that data will take determined?
Switches determine the optimal path between sender and receiver, and then establish the path before transmission.
With a SIP trunk, what is the only limitation on the number of calls that can run at any one time?
The amount of available bandwidth.
You are troubleshooting a client's wireless networking issue. Which of the following will prevent the client from connecting to the network?
The client has a wireless profile configured for the "campus" SSID, but the access point is broadcasting the "CAMPUS" SSID.
Which of the following statements regarding IPv6 subnetting is NOT accurate?
The largest IPv6 subnet capable of being created is a /64.
If the EUI-64 standard is used, what part of an IPv6 address is affected?
The last four blocks of the address.
Considering that multiple users occupy the same channel when using CDMA, how are various calls using this technology kept separate?
The packets are coded such that individual calls can be distinguished.
Diffraction has what affect on a wireless signal's propagation?
The signal is split into secondary waves that continue in the direction in which they split.
In an IPv6 address, what do the first four blocks or 64 bits of the address represent?
The site prefix or global routing prefix.
Which statement regarding the use of a bridged mode vNIC is accurate?
The vNIC will its own IP address on the physical LAN.
In a cellular network, where does each wireless base station connect to?
They connect to a mobile switching center.
Which file transfer protocol has no authentication or security for transferring files, uses UDP, and requires very little memory to use?
Trivial FTP (TFTP)
Which of the following is an advantage of leasing a frame relay circuit over leasing a dedicated circuit?
You pay only for the bandwidth you require.
Healing messages are a feature of what smart home protocol?
Z-Wave
An interface that manages traffic from multiple VLANs is known by what term?
aggregation port
In IEEE terminology, a group of stations that share an access point are said to be part of which of the following?
basic service set
What special signal is issued periodically from an AP and contains the network transmission rate and service set identifier (SSID), as well as other information needed for a computer to associate with the AP?
beacon frame
On certain Cisco products, what command can be used to create and send helper messages that support several types of UDP traffic, including DHCP, TFTP, DNS, and TACACS+?
ip helper-address
In Linux, what command can be used for viewing and setting wireless interface parameters?
iwconfig
The combination of a public key and a private key are known by what term below?
key pair
Subtracting an interesting octet value from 256 yields what number?
magic number
What 802.11 frame type is involved in association and reassociation, including probe and beacon frames?
management frames