Network+ Chapter 11: Network Performance and Recovery

What is the primary goal of disaster recovery?

- The goal of a disaster recovery plan is to ensure business continuity, which is the ability of the company to continue doing business with the least amount of interruption possible.

What command requests the next record in an SNMP log? A. SNMP Get Request B. SNMP Get Next C. SNMP Trap D. SNMP Get Response

- B. SNMP Get Next - SNMP Get Next, the NMS might then request the next row of data in the MIB database

One of your coworkers downloaded several, very large video files for a special project she's working on for a new client. When you run your network monitor later this afternoon, what list will your coworker's computer likely show up on? A. Top talkers B. Top listeners C. Giants D. Jabbers

- B. Top listeners - Identify usage anomalies, such as top talkers (hosts that send an inordinate amount of data) or top listeners (hosts that receive an inordinate amount of data)

What file must be accessed in order to analyze SNMP logs?

- MIB (Management Information Base), the list of objects managed by the NMS, as well as the descriptions of these objects, are kept in the MIB (Management Information Base). The MIB also contains data about an object's performance in a database format that can be mined and analyzed.

When shopping for a new router, what does the MTBF tell you? A. How long until that device fails B. How much it will cost to repair that device C. How long devices like this one will last on average until the next failure D. How long it will usually take to repair that device

- C. How long devices like this one will last on average until the next failure - MTBF (means time between failures), This is the average amount of time that will pass for device exactly like this one before the next failure is expected to occur.

Which power backup method will continually provide power to a server if the power foes out during a thunderstorm? A. Online UPS B. Generator C. Dual power supplies D. Standby UPS

- A. Online UPS - Online UPS always provides the power, it can handle noise, surges, and sags before the power reaches the attached device. Online UPSes intended for home or small office use are designed merely to keep your workstation running long enough for you to properly shut it down in case of a blackout.

Which QoS technique operates at Layer 2 to more efficiently route Ethernet traffic between VLANs?

- CoS (Class of Service) refers only to techniques performed at Layer 2, on Ethernet frames, and is one method of implementing QoS.

Which type of disaster recovery site contains all the equipment you would need to get up and running again after a disaster, and yet would require several weeks to implement? A. Warm site B. Standby site C. Hot site D. Cold site

- D. Cold Site - Cold Site, Computers, devices and connectivity necessary to rebuild a network exist, but they are not appropriately configured, updated, or connected. Even for a small network, this process of rebuilding your network could take weeks.

What type of adapters are required on servers in an FCoE storage network?

- FCoE (Fibre Channel over Ethernet) is a newer technology that allows FC to travel over Ethernet hardware and connections. With the installation of CAN's (converged network adapters), FCoE switches can connect to network servers and to switches for both the LAN and the SAN (Storage are Network).

What kinds of alerts can you program your network monitor to send to IT staff when it detects specific, problematic conditions?

- Faults and conditions that exceed certain thresholds can trigger alerts, and those alerts might generate notifications might be transmitted either by email or text message, also called SMS (Short Message Service), or they can automatically prompt support ticket generation.

Which fields are modified in IPv4 and IPv6 packets to help prioritize traffic for QoS?

- In IPv6 packets, DiffServ uses a similar fields known as the Traffic Class field. - DiffServ places information in the DiffServ field of an IPv4 packet.

What port do SNMP agents listen on? A. Port 161 B. Port 21 C. Port 162 D. Port 20

- A. Port 161 - When using UDP, SNMP agents receive requests from the NMS on port 161. The NMS receives agent responses and traps on its port 162.

Which of the following features of a network connection between a switch and server is not improved by link aggregation? A. Bandwidth B. Fault tolerance C. Speed D. Availability

- C. Speed - Link aggregation isn't about speed of network traffic so much as bandwidth, or total potential to handle more network traffic at one time.

What field in an IPv4 packet is altered to prioritize video streaming traffic over web surfing traffic? A. Traffic Class B. Priority Code Point C. Time to Live D. DiffServ

- D. DiffServ - DiffServ takes into account all types of network traffic, not just the time-sensitive services such as voice and video. That way , it can assign voice streams a high priority and at the same time assign unessential data streams a low priority.

Your roommate has been hogging the bandwidth on your router lately. What feature should you configure on the router to limit the amount of bandwidth his computer can utilize at any one time? A. Power Management B. Power forwarding C. Port mirroring D. Traffic Shaping

- D. Traffic shaping - Traffic shaping, also called packet shaping, involves manipulating certain characteristics of packets, data streams, or connections to manage the type and amount of traffic traversing a network or interface at any moment.

What protocol is most often used to bond ports between a switch and a busy server?

- LACP (Link Aggregation Control Protocol) dynamically coordinates communications between hosts on aggregated connections, kind of like what DHCP does for IP addressing. Because packets and, generally, sessions, aren't separated between the duplicate connection, the benefits of link aggregation are primarily noticed on busy networks.

Why might you want to install two power supplies in a critical server?

- To achieve the utmost fault tolerance, each critical device requires redundant, NIC's, SFPs, Power Supplies /PSU's, cooling fans, and process, all of which should, ideally, be able to immediately assume the duties of an identical component, a capability known as automatic failover.

When you arrive at work one morning, your inbox is full of messages complaining of a network slowdown. You collect a capture form your network monitor. What can you compare it to in order to determine what has changed?

- To identify when there's a problem on the network, you must first know what is normal for that network. A baseline is a report of the network's normal state of operation and might include a range of acceptable measurements.

What are the two main categories of UPSes?

- UPSes are classified into two general categories: Standby UPS, also called SPS (standby power supply) and Online UPS.

While troubleshooting a recurring problem on your network, you will want to examine the TCP messages being exchanged between a server and a client. Which tool should you use? A. Spiceworks B. Wireshark C. Packet Tracer D. VirtualBox

- B. Wireshark - Wireshark, it only sees the traffic the switch sends to it, which includes broadcast traffic specifically addressed to the one computer.