700-821 Cisco Iot Essentials for System Engineers Practice Questions

The Cisco IR1101 is a modular router. To add cellular connectivity, a pluggable LTE or 5G module, such as the P-LTEAP18-GL (LTE Advanced Pro), must be inserted into the router's pluggable slot. This modular design allows for flexibility and future upgrades to new cellular technologies.

Cisco IOx is an application environment that combines Cisco IOS and the Linux OS, allowing custom applications to be hosted directly on Cisco IoT network devices. This enables edge or 'fog' computing, where data can be processed locally, which is ideal for applications like real-time video analytics that require low latency and reduced data transmission.

The IC3000 is designed to bridge the gap between legacy OT systems and modern IT networks. It can connect to older sensors and industrial equipment, normalize the data, and securely transmit it to on-premises or cloud applications.

Similar to industrial routers, the IC3000 supports Cisco IOx for edge computing. This allows it to run applications that can analyze data locally, make decisions in real-time, and reduce the amount of data sent to the cloud.

Cisco SD-WAN is the ideal solution. It provides centralized management through vManage, allowing for consistent policy deployment across all sites. Its application-aware routing can monitor path performance (latency, jitter, loss) and intelligently steer critical SCADA traffic over the optimal link in real-time. It also builds a secure, encrypted overlay fabric, meeting the security requirement. The IR1800 series fully supports Cisco SD-WAN functionality.

The SEA Agent is a lightweight application running on the on-site industrial router (e.g., IR1101). Its critical role is to establish an outbound TLS tunnel to the SEA cloud broker. It listens for connection requests from the broker and then initiates the final connection to the target device on the local LAN. This outbound-only architecture means no inbound ports need to be opened on the firewall, significantly enhancing security.

In a REP segment, one port must be configured with the 'Alternate' role. This port is responsible for blocking traffic on its link to prevent a loop during normal operation. When a link failure is detected elsewhere in the segment, the Alternate port unblocks to restore connectivity. Without an Alternate port, the segment cannot form a stable, loop-free topology, leading to convergence issues.

PRP provides redundancy by duplicating packets across two independent networks (LAN_A and LAN_B). A failure in either LAN_A or LAN_B would not cause a connectivity loss for a DAN (Dual Attached Node) or a SAN connected via a RedBox, as the traffic would still be received on the other network. The RedBox's purpose is to provide this dual-attachment for a single-homed device. Therefore, if the SAN loses connectivity, the single point of failure is the physical link between the SAN itself and its RedBox.

Devices requiring 45W exceed the 30W maximum of PoE+ (802.3at) and require Cisco UPoE or 802.3bt Type 3, which can supply up to 60W per port.

The total power budget is calculated as (2 * 45W) + (3 * 15W) = 90W + 45W = 135W.

The Cisco IE 4000 Series is designed as an aggregation layer switch for industrial environments. It provides high-density Gigabit Ethernet ports and supports advanced Layer 3 routing protocols such as OSPF, EIGRP, and BGP, making it ideal for this requirement. The IE 2000 is primarily a Layer 2 access switch, and while the IE 5000 is also a Layer 3 switch, the IE 4000 is the most common fit for high-density aggregation.

Cisco Industrial Network Director (IND) is a network management system built specifically for industrial automation environments. It is designed to help operations teams gain full visibility of network devices and ease deployment and management tasks in large-scale industrial networks. While Prime Infrastructure can manage switches, IND is tailored for the OT environment and protocols.