Basic Networking v2

58.1. Match the type of threat with the cause. Hardware threats

• poor handling of key electrical components (electrostatic discharge), lack of critical spare parts, poor cabling and poor labeling.

• temperature extremes (too hot or too cold) or humidity extremes (too wet or too dry).

• physical damage to servers, routers, switches, cabling plant, and workstations.

• voltage spikes, insufficient supply voltage (brownouts), unconditioned power (noise), and total power loss.

58.2. Match the type of threat with the cause. Environmental threats

• poor handling of key electrical components (electrostatic discharge), lack of critical spare parts, poor cabling and poor labeling.

• temperature extremes (too hot or too cold) or humidity extremes (too wet or too dry).

• physical damage to servers, routers, switches, cabling plant, and workstations.

• voltage spikes, insufficient supply voltage (brownouts), unconditioned power (noise), and total power loss.

58.3. Match the type of threat with the cause. Electrical threats

• poor handling of key electrical components (electrostatic discharge), lack of critical spare parts, poor cabling and poor labeling.

• temperature extremes (too hot or too cold) or humidity extremes (too wet or too dry).

• physical damage to servers, routers, switches, cabling plant, and workstations.

• voltage spikes, insufficient supply voltage (brownouts), unconditioned power (noise), and total power loss.

58.4. Match the type of threat with the cause. Maintenance threats

• poor handling of key electrical components (electrostatic discharge), lack of critical spare parts, poor cabling and poor labeling.

• temperature extremes (too hot or too cold) or humidity extremes (too wet or too dry).

• physical damage to servers, routers, switches, cabling plant, and workstations.

• voltage spikes, insufficient supply voltage (brownouts), unconditioned power (noise), and total power loss.

62.What are two problems that can be caused by a large number of ARP request and reply messages? (Choose two.)

• Switches become overloaded because they concentrate all the traffic from the attached subnets.

• The ARP request is sent as a broadcast, and will flood the entire subnet.

• The network may become overloaded because ARP reply messages have a very large payload due to the 48-bit MAC address and 32-bit IP address that they contain.

• A large number of ARP request and reply messages may slow down the switching process, leading the switch to make many changes in its MAC table.

• All ARP request messages must be processed by all nodes on the local network.

Answer explanation

Explanation: ARP requests are sent as broadcasts:
(1) All nodes will receive them, and they will be processed by software, interrupting the CPU.
(2) The switch forwards (floods) Layer 2 broadcasts to all ports.

A switch does not change its MAC table based on ARP request or reply messages. The switch populates the MAC table using the source MAC address of all frames. The ARP payload is very small and does not overload the switch.

63.A group of Windows PCs in a new subnet has been added to an Ethernet network. When testing the connectivity, a technician finds that these PCs can access local network resources but not the Internet resources. To troubleshoot the problem, the technician wants to initially confirm the IP address and DNS configurations on the PCs, and also verify connectivity to the local router. Which three Windows CLI commands and utilities will provide the necessary information? (Choose three.)

• ping

• ipconfig

• nslookup

• netsh interface ipv6 show neighbor

• arp -a

67.What are the two most effective ways to defend against malware? (Choose two.)

• Update the operating system and other application software.

• Implement network firewalls.

• Install and update antivirus software.

• Implement a VPN.

• Implement RAID.

Answer explanation

Explanation: A cybersecurity specialist must be aware of the technologies and measures that are used as countermeasures to protect the organization from threats and vulnerabilities.

72.What two security solutions are most likely to be used only in a corporate environment? (Choose two.)

• antispyware

• virtual private networks

• intrusion prevention systems

• strong passwords

• antivirus software

76.An administrator defined a local user account with a secret password on router R1 for use with SSH. Which three additional steps are required to configure R1 to accept only encrypted SSH connections? (Choose three.)

• Enable inbound vty SSH sessions.

• Generate two-way pre-shared keys.

• Configure DNS on the router.

• Generate the SSH keys.

• Configure the IP domain name on the router.

79.What are the three parts of an IPv6 global unicast address? (Choose three.)

• subnet ID

• subnet mask

• broadcast address

• global routing prefix

• interface ID

Answer explanation

Explanation: The general format for IPv6 global unicast addresses includes a global routing prefix, a subnet ID, and an interface ID. The global routing prefix is the network portion of the address. A typical global routing prefix is /48 assigned by the Internet provider. The subnet ID portion can be used by an organization to create multiple subnetwork numbers. The interface ID is similar to the host portion of an IPv4 address.