Ch 11: Network Performance and Recovery Flashcards
When using SNMP with TLS, what port do agents receive requests on?
10161
At what point is a packet considered to be a giant?
It becomes a giant when it exceeds the medium’s maximum packet size.
Packets that are smaller than a medium’s minimum packet size are known by what term below?
runts
When a device handles electrical signals improperly, usually resulting from a bad NIC, it is referred to by what term below?
jabber
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
What 3-bit field in a 802.1Q tag is modified to set a frame’s Class of Service (CoS)?
Priority Code Point (PCP)
A highly available server is available what percentage of the time?
99.999%
What happens when an NMS uses the SNMP walk command?
The NMS uses get requests to move through sequential rows in the MIB database.
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 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)
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)
A differential backup covers what data on a system?
It includes data that has changed since the last full backup.
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
In planning for disaster recovery, what is the ultimate goal?
The continuation of business.
How does a line conditioning UPS protect network equipment?
It filters line noise from incoming power.
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
What makes up the first 6 bits of the 8-bit DiffServ field?
Differentiated Services Code Point (DSCP)
A network TAP serves what purpose on a network?
It monitors network throughput at a specific point in the network.
When viewing a syslog message, what does a level of 0 indicate?
The message is an emergency situation on the system.
Each managed object on a managed device using SNMP is assigned which of the following?
object identifier (OID)
Once a device has failed, what metric measures the average amount of time to repair?
mean time to repair (MTTR)
What does the Common Address Redundancy Protocol do?
It allows a pool of computers or interfaces to share the same IP address.
