11-12 QUIZES
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.
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.
In metro settings, end-to-end, carrier-grade Ethernet networks can be established via what protocol?
Carrier Ethernet Transport
When Comcast was found to be interfering with BitTorrent traffic, what method was being used?
Comcast was interjecting TCP segments with the RST (reset) field set.
What makes up the first 6 bits of the 8-bit DiffServ field?
Differentiated Services Code Point (DSCP)
The Link Aggregation Control Protocol was initially defined by what IEEE standard?
IEEE 802.3ad
Which of the following statements describes a RAID 0 configuration?
In a RAID 0, data is striped across multiple disks to improve performance.
What Storage Area Network (SAN) protocol runs on top of TCP, and can be used on an existing twisted-pair Ethernet network, while maintaining low cost?
Internet SCSI (iSCSI)
What does the Common Address Redundancy Protocol do?
It allows a pool of computers or interfaces to share the same IP address.
At what point is a packet considered to be a giant?
It becomes a giant when it exceeds the medium's maximum packet size.
How does a line conditioning UPS protect network equipment?
It filters line noise from incoming power.
A differential backup covers what data on a system?
It includes data that has changed since the last full backup.
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.
A network TAP serves what purpose on a network?
It provides a mirrored port for monitoring traffic between other ports.
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
What 3-bit field in a 802.1Q tag is modified to set a frame's Class of Service (CoS)?
Priority Code Point (PCP)
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)
When using satellite services for your WAN connection, what statement is accurate?
Satellite services suffer more latency and jitter issues.
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.
What happens when an NMS uses the SNMP walk command?
The NMS uses get requests to move through sequential rows in the MIB database.
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.
In planning for disaster recovery, what is the ultimate goal?
The continuation of business.
When viewing a syslog message, what does a level of 0 indicate?
The message is an emergency situation on the system.
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.
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.
Where are MPLS labels placed within a frame?
between the layer 2 header and the layer 3 header
The grouping of multiple servers so that they appear as a single device to the rest of the network is known as which term?
clustering
When using DiffServ, what type of forwarding utilizes a minimum departure rate from a given node, which is then assigned to each data stream?
expedited forwarding
When a device handles electrical signals improperly, usually resulting from a bad NIC, it is referred to by what term below?
jabber
What term is used to describe the average amount of time that will pass for a device before a failure is expected to occur?
mean time between failures (MTBF)
Once a device has failed, what metric measures the average amount of time to repair?
mean time to repair (MTTR)
Each managed object on a managed device using SNMP is assigned which of the following?
object identifier (OID)
Which type of uninterruptible power supply uses AC power to continuously charge its battery, while also providing power to devices through the battery?
online UPS
Packets that are smaller than a medium's minimum packet size are known by what term below?
runts
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)
You are attempting to determine how available your Linux systems are, and need to find the current system uptime. What command should you use?
uptime
Of all the DSL standards, which is the most commonly in use today?
ADSL
When using SNMP with TLS, what port do agents receive requests on?
10161
Multiplexing enables a single T1 circuit to carry how many channels?
24
The C-Band utilized by satellites consists of what frequency range?
3.4 - 6.7 GHz
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 ISDN connection, what amount of throughput did a single B channel provide?
64 Kbps
A highly available server is available what percentage of the time?
99.999%
