T4 Flashcards
A technician installs a new piece of hardware and now needs to add the device to the network management tool database. However, when adding the device to the tool using SNMP credentials, the tool cannot successfully interpret the results. Which of the following needs to be added to allow the network management tool to interpret the new device and control it using SNMP?
NIV contains OIDs
Management Information Base (MIB) is used for managing all entities on a network using Simple Network Management Protocol. It would allow the tool to interpret the information received correctly.
A MIB or Management Information Base is a formatted text file that resides within the SNMP manager designed to collect information and organize it into a hierarchical format. Inside the MIB there are many different managed objects which can be identified by an OID or Object Identifier.
An organization wants to choose an authentication protocol that can be used over an insecure network without implementing additional encryption services. Which of the following protocols should they choose?
The Kerberos protocol is designed to send data over insecure networks while using strong encryption to protect the information. RADIUS, TACACS+, and PAP are all protocols that contain known vulnerabilities that would require additional encryption to secure them during the authentication process.
What is the term for exploiting a weakness in a user’s wireless headset to compromise their smartphone?
Bluejacking is the sending of unsolicited messages over Bluetooth to Bluetooth-enabled devices such as mobile phones, PDAs, or laptop computers, sending a vCard which typically contains a message in the name field to another Bluetooth-enabled device via the OBEX protocol
Which of the following types of telecommunication links is used to provide high-speed internet service over a system of coaxial or HFC cables?
Data Over Cable Service Interface Specification (DOCSIS) is used to connect a client’s local area network to a high-bandwidth internet service provider over an existing coaxial cable TV system.
A network technician is troubleshooting connectivity problems between switches but suspects the ports are not properly labeled. What option will help to identify the switches connected to each port quickly?
By enabling a discovery protocol on the network devices, the technician will be able to get detailed information such as the IP addresses, system version, and device information from supporting devices directly. There are three primary discovery protocols: simple network management protocol (SNMP), link layer discovery protocol (LLDP), and ping.
Which communication technology would MOST likely be used to increase bandwidth over an existing fiber-optic network by combining multiple signals at different wavelengths?
Dense wavelength-division multiplexing (DWDM) is a high-speed optical network type commonly used in MANs (metropolitan area networks). DWDM uses as many as 32 light wavelengths on a single fiber, where each wavelength can support as many as 160 simultaneous connections.
You are troubleshooting your company’s T-1 connection to your ISP. The ISP has asked you to place a loopback on the device which connects your T-1 line to their central office. Which of the following devices should you connect a loopback adapter to test the connection?
A CSU/DSU (Channel Service Unit/Data Service Unit) converts digital data frames from the communications technology used on a local area network (LAN) into frames appropriate to a wide-area network (WAN) and vice versa. A CSU/DSU is used to terminate a T1 connection at the customer’s site. A Data Over Cable Service Interface Specification (DOCSIS) modem is used to connect a client’s local area network to a high-bandwidth internet service provider over an existing coaxial cable TV system. A fiber optic modem (FOM) is used to connect a client’s local area network to a high-bandwidth fiber-optic network for wide area network connectivity. A digital subscriber line (DSL) modem is a device used to connect a computer or router to a telephone line which provides the digital subscriber line service for connection to the Internet.
An administrator has a virtualization environment that includes a vSAN and iSCSI switching. Which of the following actions could the administrator perform to improve data transfers’ performance over the iSCSI switches?
When using an iSCSI SAN (with iSCSI switching), we can improve network performance by enabling jumbo frames. A jumbo frame is a frame with an MTU of more than 1500. By setting the MTU to 9000, there will be fewer but larger frames going over the network. Enabling jumbo frames can improve network performance by making data transmissions more efficient. iSCSI is commonly used in storage area networks (SAN) within a datacenter.
Your company has just gotten a new OC-12 installed to support your datacenter. The telecommunications provider has installed the connection from their main offices to your demarcation point. You connect the OC-12 to your network, but you are noticing many dropped packets and errors. You suspect this may be a layer 1 issue. Which of the following tools can you use to help identify the source of the issue on this connection?
he question talks about an OC-12 connection, which is an optical carrier or fiber optic cable. Based on that, you know the only one of these options has anything to do with a fiber cable, and that is the OTDR (Optical Time-Domain Reflectometer). An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize an optical fiber. An OTDR injects a series of optical pulses into the fiber under test and extracts, from the same end of the fiber, light that is scattered (Rayleigh backscatter) or reflected back from points along the fiber.
Which of the following layers within software-defined networking determines how to route a data packet on 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 application layer focuses on the communication resource requests or information about the network. 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. 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.
