T2 Flashcards
Jason, a network technician, is troubleshooting a single-mode fiber that provides network connectivity to a remote site. He sees that the link light is off on the router’s network interface, and suspects that the fiber may have a break someone between his router and the remote site. Single-mode fiber is not providing network connectivity to a remote site. Which of the following tools could be used to identify the location of the break in the fiber?
An Optical Time Domain Reflectometer (OTDR) is used by organizations to certify the performance of new fiber optics links and detect problems with existing fiber links. An OTDR can identify if a fiber cable is broken and provide an approximate location for the break in meters or feet.
A fiber light meter, also known as an optical power meter, is used to measure the power in an optical signal over a fiber optic cable. A fiber light meter could be used to test if the cable is broken, but it would not be able to determine where the break in the fiber cable is located
A tone generator is used with a toner probe to accurately identify the location of a cable pair or conductor within a wiring bundle, cross-connection point, or at the remote end. A tone generator is used with copper cables, not fiber optic cables.
You are troubleshooting a cable modem for a home user’s network. The connection speeds are much lower than you expected. You suspect the coaxial cable between the wall jack and the cable modem is faulty. Based on your research, a coaxial cable used in data networks should have an impedance of 50 ohms. Which of the following tools should you use to measure the resistance of the coaxial cable?
A multimeter is a measuring instrument that can measure the voltage, resistance, and amperage of a cable or conduit. To test this cable, you should set the multimeter to resistance and connect one of the multimeter’s leads to each end of the coaxial cable to determine the resistance as measured in ohms.
A cable tester is used to verify the electrical connections in a twisted pair or coaxial cable. A cable certifier is used to test the continuity of a cable and verify that a cable meets its specifications such as the bandwidth, frequency, and length. A spectrum analyzer is used to measure the magnitude of an input signal’s frequency.
Dion Training’s remote office is experiencing poor network performance. You have been asked to look at the traffic patterns for the remote office and compare them to the network performance baselines. Which of the following tools should you utilize?
A NetFlow analyzer is used to perform monitoring, troubleshooting, inspection, interpretation, and synthesis of network traffic flow data. A NetFlow analyzer can help you quickly identify traffic patterns and the different applications/protocols in use on the network.
An organization has hired you to upgrade its wired computer network. The network currently uses static routing for the internal network, but the organization wants to reconfigure it to use a dynamic routing protocol. The new dynamic routing protocol must support both IPv4 and VLSM. Based on the requirements provided, which of the following routing protocols should you enable and configure?
Open Shortest Path First (OSPF) is a link-state routing protocol that was developed for IP networks and is based on the Shortest Path First (SPF) algorithm. OSPF is an Interior Gateway Protocol (IGP).
VRRP, RIPv1, and HSRP do not support VLSM. The Virtual Router Redundancy Protocol is a computer networking protocol that provides for automatic assignment of available Internet Protocol routers to participating hosts. This increases the availability and reliability of routing paths via automatic default gateway selections on an IP subnetwork. The Hot Standby Router Protocol is a Cisco proprietary redundancy protocol for establishing a fault-tolerant default gateway.
The Routing Information Protocol (RIP) is one of the oldest distance-vector routing protocols which employs the hop count as a routing metric. RIP prevents routing loops by implementing a limit on the number of hops allowed in a path from source to destination. While RIPv1 does not support VLSM, RIPv2 does support VLSM but was not an option in this question.
Which of the following types of fire suppression systems utilizes a sprinkler system with water to extinguish a fire but requires both an actuator and the sprinklers to be tripped prior to water being released?
OBJ-3.3: A fire suppression system is an engineered set of components that are designed to extinguish an accidental fire in a workplace or datacenter. A pre-action system minimizes the risk of accidental release from a wet pipe system. With a pre-action system, both a detector actuation like a smoke detector and a sprinkler must be tripped prior to water being released.
A wet pipe system is the most basic type of fire suppression system, and it involved using a sprinkler system and pipes that always contain water in the pipes.
Special suppression systems, like a clean agent system, use either a halocarbon agent or inert gas. When releases, the agents will displace the oxygen in the room with the inert gas and suffocates the fire.
Dion Training is concerned with the threat of an attacker modifying the MAC address to IP bindings within the local area network. Which of the following could be enabled on the company’s network to prevent this from occurring?
Dynamic ARP Inspection (DAI) is a security feature that validates Address Resolution Protocol (ARP) packets in a network. DAI allows a network administrator to intercept, log, and discard ARP packets with invalid MAC address to IP address bindings.
Your network relies on the use of ATM cells. At which layer of the OSI model do ATM cells operate?
the data link layer (layer 2) of the OSI model, the basic unit of transfer is called a frame. In an ATM network, though, these frames are called cells and are of a fixed (53 octets or bytes) length that allows for faster switching of the cells across the network.
what is wins server?
A WINS server is a Microsoft Windows-based server running the Windows Internet Name Service (WINS) that can accept NetBIOS name registrations and queries. WINS servers maintain a database of NetBIOS name to IP address mappings for WINS clients on the network and speed up NetBIOS name resolution by eliminating broadcasts.
Which of the following is a connectionless protocol?
ICMP, UDP, IP, and IPX are well-known examples of connectionless protocols
Which of the following technologies deliver multiple voice calls over a copper wire if you have an ISDN or T-1 connection?
Time-division multiplexing allows for two or more signals or bitstreams to be transferred in what appears to be simultaneous sub-channels in one communication channel but is physically taking turns on the channel. This is the technology used in a single PRI (ISDN or T-1) service to essentially share a single cable but pass multiple voice calls over it.
A technician is called to investigate a connectivity issue to a remote office connected by a fiber optic cable. Using a light meter, it is determined that there is excessive dB loss. The installation has been working for several years. The switch was recently moved to the other side of the room and a new patch cable was installed. Which of the following is most likely the reason for the excessive dB loss?
When fiber optic connectors become dirty, signal loss can cause severe problems and performance issues. Something as simple as oil from a technician’s hand can render a fiber connector dirty and cause a loss of signal. The technician will need to use appropriate cleaning cloth to clean the dirty connectors and restore the service.
Due to numerous network misconfiguration issues in the past, Dion Training adopted a policy that requires a second technician to verify any configuration changes before they are applied to a network device. When the technician inspects a newly proposed configuration change from a coworker, she determines that it would improperly configure the AS number on the device. Which of the following issues could have resulted from this configuration change if it was applied?
OBJ-5.5: BGP (Border Gateway Protocol) is used to route data between autonomous systems (AS). A collection of networks within the same administrative domain is called an autonomous system (AS). The routers within an AS to use an interior gateway protocol, such as the Routing Information Protocol (RIP) or the Open Shortest Path First (OSPF) protocol, exchange routing information among themselves. Autonomous systems operate at layer 3 and are focused on wired networks. Therefore, the frequency mismatch, decreased wireless coverage areas, and spanning tree ports would not be affected by the improper configuration of an AS number on a device.
A user was moved from one cubicle in the office to a new one a few desks over. Now, they are reporting that their VoIP phone is randomly rebooting. When the network technician takes the VoIP phone and reconnects it in the old cubicle, it works without any issues. Which of the following is MOST likely the cause of the connectivity issue?
Since the scenario states the VoIP phone works properly from the old desk, it is properly configured and the hardware itself works. This indicates the problem must be caused by the new desk which contains a different network cable from the switch to the wall jack in the cubicle. This is most likely a bad cable, such as one with a short in it. To verify this theory, the technician should use a cable tester to verify if the cable does have a short or not. While attenuation is a possible cause of the problem described, it is unlikely since the employee only moved a few desks (10-15 feet), and is not a large enough distance to cause significant attenuation issues.
Which of the following layers within software-defined networking focuses on providing network administrators the ability to oversee network operations, monitor traffic conditions, and display the status of the network?
The management plane is used to monitor traffic conditions, the status of the network, and allows network administrators to oversee the network and gain insight into its operations.
The application layer focuses on the communication resource requests or information about the network.
The control layer uses the information from applications to decide how to route a data packet on the network and to make decisions about how traffic should be prioritized, how it should be secured, and where it should be forwarded to.
The infrastructure layer contains the physical networking devices that receive information from the control layer about where to move the data and then perform those movements.
Which of the following open-source remote access tools allows users to connect to their desktop remotely, see what is on their screen, and control it with their mouse and keyboard?
VNC (virtual network computing) is a remote access tool and protocol. It is used for screen sharing on Linux and macOS. RDP is not open-source.
