N10-008 Premium Exam Questions

TTL stands for Time to Live, and it is a field on DNS records that controls how long each record is valid and cached by the DNS resolver before it expires and requests a new one. The TTL value is measured in seconds, and it affects how quickly DNS changes propagate across the Internet. A lower TTL means that the DNS resolver will refresh the record more frequently, but it also increases the load on the DNS servers. A higher TTL means that the DNS resolver will cache the record longer, but it also delays the update of the record.

Enterprise authentication is a method of securing wireless networks that uses an external authentication server, such as RADIUS, to verify the identity of users and devices. Enterprise authentication can provide user traceability by logging the network connections and activities of each authenticated user. This can help the organization meet its security requirement and comply with any regulations or policies that mandate user accountability12.

References:

• CompTIA Network+ N10-008 Certification Exam Objectives, page 83
• CompTIA Network+ Cert Guide: Wireless Networking, page 13

The type of data center architecture that will most likely be used in a large SDN and can be extended beyond the data center is spine and leaf. Spine and leaf is a network topology that consists of two layers of switches: spine switches and leaf switches. Spine switches are interconnected to each other and form the core of the network, while leaf switches are connected to each spine switch and form the access layer of the network. Spine and leaf topology provides high scalability, performance, and flexibility for data center networks, especially for SDN (Software Defined Networking) environments that require dynamic traffic flows and virtualization. References: CompTIA Network+ N10-008 Certification Study Guide, page 16; The Official CompTIA Network+ Student Guide (Exam N10-008), page 1-9.

When a fiber uplink is operating at 100% capacity for an extended period of time, it can cause sustained link saturation. This can impact the network's performance by increasing latency. Latency is the time it takes for a packet to travel from the source to its destination. When there is link saturation, packets may have to wait in a queue before being transmitted, which increases the time it takes for them to reach their destination. As a result, users may experience delays or timeouts when accessing network resources.

Other metrics such as jitter, speed, and bandwidth are also important, but they are not as directly impacted by sustained link saturation as latency.