final revision Flashcards
what is BPDU?
A bridge protocol data unit (BPDU) is a data message transmitted across a local area network to detect loops in network topologies. A BPDU contains information regarding ports, switches, port priority and addresses.
BPDUs contain the information necessary to configure and maintain spanning tree topology. They are not forwarded by switches, but the information is used by switches to calculate their own BPDUs for information passing.
You are configuring a network to utilize SNMPv3 to send information from your network devices back to an SNMP manager. Which of the following SNMP options should you enable to ensure the data is transferred confidentially?
authPriv option ensures that the communications are sent with authentication and privacy. This uses MD5 and SHA for authentication and DES and AES for privacy and encryption.
- authNoPriv is for authentication, but no privacy
That’s because SNMP is particularly good for having devices — usually sensors, servers and network architecture devices — share information about themselves with other devices on the same network running different software on different hardware.
Jason is a network manager leading a project to deploy a SAN. He is working with the vendor’s support technician to set up and configure the SAN on the enterprise network. To begin SAN I/O optimization, what should Jason provide to the vendor support technician?
A network diagram is a visual representation of network architecture. It maps out the structure of a network with a variety of different symbols and line connections. This information will be important when deploying a Storage Area Network (SAN) on the enterprise network.
An offsite tape backup storage facility is involved with a forensic investigation. The facility has been told they cannot recycle their outdated tapes until the conclusion of the investigation. Which of the following is the MOST likely reason for this?
A legal hold is a process that an organization uses to preserve all forms of relevant information when litigation is reasonably anticipated. If a legal hold notice has been given to the backup service, they will not destroy the old backup tapes until the hold is lifted.
The process of discovery is the formal process of exchanging information between the parties about the witnesses and evidence they will present at trial. The chain of custody is the chronological documentation or paper trail that records the sequence of custody, control, transfer, analysis, and disposition of materials, including physical or electronic evidence. A data transport request is a formalized request to initiate a data transfer by establishing a circuit or connection between two networks.
Which of the following types of network documentation would provide a drawing of the network cabling imposed over the floorplan for an office building?
A physical network diagram is used to show the actual physical arrangement of the components that make up the network, including cables and hardware.
A logical diagram is used to illustrate the flow of data across a network and is used to show how devices communicate with each other. These logical diagrams usually include the subnets, network objects and devices, routing protocols and domains, voice gateways, traffic flow, and network segments in a given network.
Wiring diagrams are used to clearly label which cables are connected to which ports. The more in-depth wiring diagrams will include a floorplan or rack diagram, so you can see how the cables are run in the physical environment.
A wireless site survey is the process of planning and designing a wireless network to provide a wireless solution that will deliver the required wireless coverage, data rates, network capacity, roaming capability, and quality of service (QoS). The site survey report will contain a floorplan of the areas surveyed with the wireless coverage areas and signal strengths notated on it.
Your company wants to create highly available datacenters. Which of the following will allow the company to continue maintaining an Internet presence at all sites if the WAN connection at their own site goes down?
If a WAN link goes down, BGP will route data through another WAN link if redundant WAN links are available. Border Gateway Protocol (BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information between autonomous systems (AS) on the Internet
VNC port
tcp 5900
Which type of wireless technology are OFDM, QAM, and QPSK examples of?
Modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a separate signal called the modulation signal that typically contains information to be transmitted. WiFi can use different digital modulation schemes for data transmission. Common types of modulation include Orthogonal frequency-division multiplexing (OFDM), Quadrature Amplitude Modulation (QAM), and Quadrature Phase-shift keying (PSK).
Lynne is a home user who would like to share music throughout the computers in her house using an external USB hard drive connected to a router that she purchased over a year ago. The manufacturer states that the router can recognize drives up to 4TB in size, but she cannot get her 3TB hard drive to show up on the network. Which of the following should Lynne do to solve this issue?
Routers can be updated by conducting a firmware flash. This is similar to upgrading or patching your computer’s operating system or even updating a device driver. By flashing the firmware, it can provide the ability to communicate with newer devices and remove known software vulnerabilities from the device.
A technician just completed a new external website and set up an access control list on the firewall. After some testing, only users outside the internal network can access the site. The website responds to a ping from the internal network and resolves the proper public address. What can the technician do to fix this issue while causing internal users to route to the website using its internal IP address?
The Domain Name System (DNS) uses port 53 and is a hierarchical and decentralized naming system for computers, services, or other resources connected to the Internet or a private network. Split Domain Name System (Split DNS) is an implementation in which separate DNS servers are provided for security and privacy management for internal and external networks. This can provide a security and privacy management mechanism by logical or physical separation of DNS information for network-internal access and access from an insecure, public network like the Internet. Under this configuration, there are two sets of DNS information, and the results are provided based upon the source address of the requester (internal or external).
Which of the following must be added to a VLAN’s gateway to improve the security of the VLAN?
Without a properly configured ACL, there is no additional security provided by a VLAN. A VLAN (virtual local area network) is any broadcast domain that is partitioned and isolated in a computer network at the data link layer (OSI layer 2). Adding a VLAN to a network provides segmentation of the traffic and traffic must be routed between the VLANs. This allows network administrators the opportunity to allow or deny traffic into or out of a given VLAN for additional security by using access control lists.
Michael, a system administrator, is troubleshooting an issue remotely accessing a new Windows server on the local area network using its hostname. He cannot remotely access the new server, but he can access another Windows server using its hostname on the same subnet. Which of the following commands should he enter on his workstation to resolve this connectivity issue?
Since this is a Windows-based network, the client is likely attempting to connect to the servers using NetBIOS. NetBIOS stores a local cached name table in the LMHOSTS file on each client. If the entry in the client file is pointing to the wrong IP, this could cause the connectivity issues described. Therefore, the system administrator should enter the “nbtstat -R” command to purge and reload the cached name table from the LMHOST file on their Windows workstation.
A home user reports to a network technician that the Internet is slow when they attempt to use their smartphone or laptop with their Wi-Fi network. The network administrator logs into the admin area of the user’s access point and discovers that multiple unknown devices are connected to it. What is MOST likely the cause of this issue?
Wi-Fi Protected Setup (WPS) allows users to configure a wireless network without typing in the passphrase. Instead, users can configure devices by pressing buttons or by entering a short personal identification number (PIN). Unfortunately, WPS is fairly easy to hack and unknown devices can then connect to your network without permission.
You are working as a network technician running new unshielded twisted pair cables from the intermediate distribution frame to the individual offices on the same floor. The cable comes in 1000 foot spools. Which of the following tools should you use to break the cable into shorter distances?
A cable snip or cable cutter is used to cut copper cables into shorter lengths from a longer spool of wound cable.
A cable crimper is used to join the internal wires of a twisted pair cable with metallic pins houses inside a plastic connector, such as an RJ-45 connector. A cable stripper is a hand-held tool that is used to remove the insulation or outer sheath from copper cables such as UTP, STP, or coaxial cables. A punchdown tool is used to insert wires into insulation displacement connectors on patch panels, keystone modules, or punchdown blocks.
Jason is a network manager leading a project to deploy a SAN. He is working with the vendor’s support technician to set up and configure the SAN on the enterprise network. To begin SAN I/O optimization, what should Jason provide to the vendor support technician?
A network diagram is a visual representation of network architecture. It maps out the structure of a network with a variety of different symbols and line connections. This information will be important when deploying a Storage Area Network (SAN) on the enterprise network.
A baseline is a process for studying the network at regular intervals to ensure that the network is working as designed. Asset management is used to record and track an asset throughout its life cycle, from procurement to disposal. Access to the datacenter will only be required if the vendor’s support technician will be physically working in the datacenter and not performing a remote installation.
