A 110 block is a type of punch-down block that is used to terminate twisted-pair cables in Ethernet networks. It is a non-proprietary standard that is widely used in structured cabling systems for voice and data applications. A 110 block can support up to 100 MHz of bandwidth and can be used with Cat 3, Cat 5, Cat 5e, and Cat 6 cables12.
A 66 block is another type of punch-down block that is mainly used for telephone wiring. It is an older and less reliable standard than the 110 block and does not support high-speed data transmission3. A BiX block is a proprietary punch-down block that is developed by NORDX/CDT and is mostly used in Canada. It can support up to 250 MHz of bandwidth and can be used with Cat 5e and Cat 6 cables4. A Krone block is another proprietary punch-down block that is developed by ADC Krone and is mostly used in Europe. It can support up to 100 MHz of bandwidth and can be used with Cat 5 and Cat 5e cables.
Therefore, the best option for the customer who wants to use non-proprietary standards is the 110 block.

* VLAN hopping is a type of network attack that allows an attacker to access network resources or traffic that belong to a different VLAN than the one the attacker is connected to12.
* VLAN hopping can be performed in two ways: switch spoofing or double tagging12.
* Switch spoofing is when an attacker configures their device to act as a trunk port and negotiates trunking with the switch, allowing the attacker to access all VLANs on the trunk link12.
* Double tagging is when an attacker sends a packet that contains two VLAN tags, one for the attacker's VLAN and one for the target VLAN. The first tag is stripped off by the switch, and the second tag is forwarded to the target VLAN, bypassing the VLAN isolation12.
* Double tagging is an example of an attack that utilizes a network packet that contains multiple network tags12.
* MAC flooding is a type of network attack that floods the switch's MAC address table with fake or spoofed MAC addresses, causing the switch to enter a fail-open mode and broadcast all traffic to all ports, allowing the attacker to capture or modify the traffic12. MAC flooding does not involve multiple network tags12.
* DNS spoofing is a type of network attack that alters the DNS records or responses to redirect the user to a malicious website or server, instead of the legitimate one12. DNS spoofing does not involve multiple network tags12.
* ARP poisoning is a type of network attack that sends fake or spoofed ARP messages to associate the attacker's MAC address with the IP address of another device, such as the gateway or the server, allowing the attacker to intercept or modify the traffic between the devices12. ARP poisoning does not involve multiple network tags12. References:
* 1: CompTIA Network+ N10-008 Exam Cram, 6th Edition, Chapter 7: Network Security Concepts and Tools, p. 318-319
* 2: CompTIA Network+ N10-008 Cert Guide, 1st Edition, Chapter 13: Network Attacks and Mitigation Techniques, p. 615-616

The change management process is the correct answer because it ensures that any changes to the network, such as updating the STP (Spanning Tree Protocol) port cost, are reviewed, approved, documented, and communicated to all relevant stakeholders. This process minimizes the risk of unintended disruptions or negative impacts on the network and ensures that all changes are aligned with business objectives.

The IEEE standard for link cost for a Fast Ethernet interface is 100, and for a Gigabit Ethernet interface is 19. These values are based on the bandwidth of the interface, with lower values indicating a higher-bandwidth interface.