CompTIA Updated SK0-005 Exam Questions and Answers by ryker

A mantrap is a security device that consists of a small space with two sets of interlocking doors, such that the first set of doors must close before the second one opens. A mantrap can be used to control access to a data center by verifying the identity and weight of the person entering. A bollard is a sturdy post that prevents vehicles from entering a restricted area. Geofencing is a technology that uses GPS or RFID to create a virtual boundary around a location and trigger an action when a device crosses it. RFID is a technology that uses radio waves to identify and track objects or people. References:

• https://www.techopedia.com/definition/16293/mantrap
• https://www.techopedia.com/definition/1437/bollard
• https://www.techopedia.com/definition/23961/geofencing
• https://www.techopedia.com/definition/506/radio-frequency-identification-rfid

The correct answer is D. A virtual switch.

A virtual switch is a software-based network device that connects the virtual machines (VMs) in a virtual environment and allows them to communicate with each other and with the physical network. A virtual switch can also create and manage virtual LANs (VLANs), which are logical segments of a network that separate the traffic of different VMs or groups of VMs. A VLAN needs a DHCP server to assign IP addresses to the VMs that belong to it. A virtual switch can act as a DHCP relay agent and forward the DHCP requests from the VMs to the DHCP server on the physical network. This way, the VMs can receive correct IP addresses for their VLANs123

A virtual router is a software-based network device that routes packets between different networks or subnets. A virtual router can also create and manage VLANs, but it is not necessary for a VM to receive a correct IP address. A virtual router can be used to provide additional security, redundancy, or load balancing for the VMs12

A host NIC is a physical network interface card that connects the host machine to the physical network. A host NIC can also support VLAN tagging, which allows the host machine to communicate with different VLANs on the network. However, a host NIC alone cannot ensure that a VM receives a correct IP address for its VLAN. The host NIC needs to be connected to a virtual switch that can relay the DHCP requests from the VMs to the DHCP server12

A VPN is a virtual private network that creates a secure tunnel between two or more devices over the internet. A VPN can be used to encrypt and protect the data traffic of the VMs, but it is not related to the configuration of VLANs or IP addresses. A VPN does not affect how a VM receives a correct IP address for its VLAN14

A vNIC is a virtual network interface card that connects a VM to a virtual switch or a virtual router. A vNIC can also support VLAN tagging, which allows the VM to communicate with different VLANs on the network. However, a vNIC alone cannot ensure that a VM receives a correct IP address for its VLAN. The vNIC needs to be connected to a virtual switch or a virtual router that can relay the DHCP requests from the VMs to the DHCP server12

The first thing that the technician should do to return the server to service as soon as possible is downgrade the NIC firmware. Firmware is a type of software that controls the basic functions of hardware devices, such as network interface cards (NICs). Firmware updates can provide bug fixes, performance improvements, or new features for hardware devices. However, firmware updates can also cause compatibility issues, configuration errors, or functionality failures if they are not installed properly or if they are not compatible with the device model or driver version. Downgrading the firmware means reverting to an older version of firmware that was previously working fine on the device. Downgrading the firmware can help resolve any problems caused by a faulty firmware update and restore normal operation of the device.

The administrator should use 172.16.19.241 as an IP address to be in compliance with RFC 1918 standard. RFC 1918 defines three ranges of IP addresses that are reserved for private internets, meaning they are not globally routable on the public Internet and can be used within an enterprise without any risk of conflict or overlap with other networks. These ranges are:

10.0.0.0 - 10.255.255.255 (10/8 prefix) 172.16.0.0 - 172.31.255.255 (172.16/12 prefix) 192.168.0.0 - 192.168.255.255 (192.168/16 prefix)

Out of these ranges, only 172.16.19.241 falls within one of them (172.16/12 prefix). The other options are either public IP addresses that belong to other organizations or networks (11.251.196.241, 171.245.198.241) or invalid IP addresses that do not conform to any standard (193.168.145.241).