500-470 Cisco Enterprise Networks SDA, SDWAN and ISE Exam for System Engineers Question and Answers

https://www.arista.com/assets/data/pdf/Whitepapers/Arista_Networks_VXLAN_White_Paper.pdf

A VxLAN header adds 50 bytes to an original Ethernet frame. This is because a VxLAN header consists of the following components:

• 8-byte outer UDP header for VxLAN: The default VxLAN destination UDP port number is 47891
• 20-byte outer IP header: Valid addresses of VTEPs or VxLAN multicast groups on the transport network. Devices in the transport network forward VxLAN packets based on the outer IP header1
• 8-byte VxLAN header: VxLAN information for the frame. It includes a 24-bit VxLAN Network Identifier (VNI) that identifies the VxLAN of the frame, and an 8-bit flags field that indicates the validity of the VNI1
• 14-byte inner Ethernet header: The original Ethernet header of the encapsulated frame. It includes the source and destination MAC addresses, the EtherType, and optionally a 4-byte VLAN tag2

The total size of these components is 8 + 20 + 8 + 14 = 50 bytes. Therefore, a VxLAN header adds 50 bytes to an original Ethernet frame.

References :=

• VXLAN packet format - Aruba
• MTU Considerations for VXLAN | Matt Oswalt

Syslog, FNF (Flexible NetFlow), and SNMP (Simple Network Management Protocol) are three technologies that can be deployed to gather data and provide insight into the network performance, health, and behavior. Syslog is a standard protocol for logging messages from network devices, such as routers, switches, firewalls, and servers. Syslog messages can be sent to a centralized server for analysis, correlation, and alerting. FNF is a Cisco technology that captures and exports information about network flows, such as source and destination IP addresses, ports, protocols, bytes, packets, and timestamps. FNF can be used to monitor network traffic patterns, identify anomalies, and optimize network resources. SNMP is a protocol that allows network devices to communicate with management systems, such as Cisco DNA Center. SNMP can be used to collect statistics, configuration, and status information from network devices, as well as to send commands and notifications. SNMP can help network administrators to troubleshoot, configure, and manage their network devices remotely. References: Cisco DNA Center User Guide, Release 1.3.1.0 - Monitor the Network 1, Cisco DNA Center User Guide, Release 1.3.1.0 - Configure Flexible NetFlow 2, Cisco DNA Center User Guide, Release 1.3.1.0 - Configure SNMP 3

https://www.cisco.com/c/en/us/td/docs/cloud-systems-management/network-automation-and-management/dna-center/1-2/user_guide/b_dnac_ug_1_2/b_dnac_ug_1_2_chapter_010010.pdf

The workflow that is necessary for setting up a network hierarchy is Design. The Design area is where you create the structure and framework of your network, including the physical topology, network settings, and device type profiles that you can apply to devices throughout your network. You can create a network hierarchy that represents your network’s geographical locations, such as sites, buildings, and floors. You can also define global network settings, such as device credentials, IP address pools, service provider profiles, and network servers. You can also create network profiles, which are collections of design settings that you can assign to devices based on their roles and functions1.

References:

 1: [Cisco DNA Center User Guide, Release 2.2.3 - Design Network Hierarchy and Settings [Cisco DNA Center] - Cisco]

https://sdwan-docs.cisco.com/Product_Documentation/Software_Features/Release_18.2/05Sec urity/01Security_Overview/Data_Plane_Security_Overview

 vEdge is the Cisco SD WAN component that provides a secure data plane with remote vEdge routers. vEdge routers are the devices that sit at the edge of the SD WAN fabric and connect to the WAN transports, such as MPLS, Internet, or LTE. vEdge routers establish secure IPsec tunnels with other vEdge routers in the fabric and exchange routing and policy information with the vSmart controller. vEdge routers also perform application-aware routing, QoS, and security functions on the data plane traffic. vEdge routers can be physical or virtual devices and can be deployed in branch, campus, data center, or cloud environments1.

The other options, vBond, vSmart, and vManage, are not the components that provide a secure data plane with remote vEdge routers. vBond is the orchestrator that performs the initial authentication and authorization of vEdge routers and assigns them to a vSmart controller. vSmart is the controller that distributes the control and data policies and the network topology information to the vEdge routers. vManage is the management platform that provides centralized configuration, monitoring, and troubleshooting of the SD WAN fabric1. References := : 1: Cisco SD-WAN Getting Started Guide - Cisco SD-WAN Overview [Cisco SD-WAN] - Cisco

Some of the statements that are true regarding Cisco SD-WAN license tiers are:

• With Pro license, control and data policies are supported2. This license tier enables network operators to define and enforce policies for traffic shaping, quality of service (QoS), application optimization, and security2.
• With Plus license, split-tunnel is supported3. This license tier enables network operators to use split-tunneling technology to route traffic through different paths based on application or user preferences3.
• With Enterprise license, vAnalytics is included4. This license tier enables network operators to use vAnalytics feature to collect and analyze data from various sources such as endpoints, applications, devices, networks, and cloud services4.

Cisco ISE configuration capabilities include the following features:

• ISE Deployment Assistant (IDA) is a built-in application designed to accelerate the deployment of Cisco Identity Service Engine (ISE). IDA guides the user through the initial setup, configuration, and verification of ISE with a step-by-step wizard. IDA also provides best practices and recommendations for common deployment scenarios, such as wireless, wired, VPN, guest, and BYOD1.
• Cisco ISE includes wireless setup wizard and visibility wizard. The wireless setup wizard simplifies the configuration of ISE for wireless access by automating the tasks of adding network devices, creating authorization profiles, and applying policies. The visibility wizard helps the user to enable device profiling and posture services, and to view the endpoint information and compliance status on the ISE dashboard2.
• ISE wizards and per-canned configurations ease ISE roll-out significantly. ISE wizards are interactive tools that assist the user in configuring various features and functions of ISE, such as certificates, network access devices, authentication and authorization policies, guest access, BYOD, and TrustSec. Per-canned configurations are predefined templates that provide common settings and values for ISE components, such as policy sets, authorization profiles, and network conditions. The user can apply these templates to quickly configure ISE for specific use cases, such as 802.1X, MAB, or web authentication3.

The other options, Cisco Active Advisor and ISE command line, are not accurate descriptions of ISE configuration capabilities. Cisco Active Advisor is a separate cloud-based service that provides network health and security checks, device lifecycle management, and best practice recommendations for Cisco devices. It is not directly related to ISE deployments. ISE command line is an interface that allows the user to perform administrative tasks, such as backup and restore, password recovery, and troubleshooting. However, ISE does not require an understanding of the command line for set-up and configuration, as most of the functions can be done through the graphical user interface (GUI). References := : 1: ISE Deployment Assistant (IDA) - Cisco Identity Services Engine - Cisco, 2: Cisco Identity Services Engine Administrator Guide, Release 2.7 - Wireless Setup Wizard [Cisco Identity Services Engine] - Cisco, 3: Cisco Identity Services Engine Administrator Guide, Release 2.7 - ISE Wizards [Cisco Identity Services Engine] - Cisco, : Cisco Active Advisor - Cisco, : Cisco Identity Services Engine CLI Reference Guide, Release 2.7 - Using the Command-Line Interface [Cisco Identity Services Engine] - Cisco

Self-healing functionality on vEdges refers to the ability of the vEdge routers to recover from failures or errors that affect their connectivity or performance. Two examples of self-healing functionality on vEdges are:

• In software upgrade process, rolling back to the previously running software image when connectivity to vManage fails: When a vEdge router is upgraded to a new software version, it maintains a backup copy of the previous software image and configuration. If the vEdge router loses connectivity to the vManage controller during or after the upgrade process, it automatically reboots and restores the previous software image and configuration. This ensures that the vEdge router can resume its normal operation and reconnect to the vManage controller1.
• With configuration change, rolling back the configuration change when loss of connectivity to vManage: When a vEdge router receives a configuration change from the vManage controller, it applies the change and verifies the connectivity to the vManage controller. If the vEdge router detects that the configuration change has caused a loss of connectivity to the vManage controller, it automatically reverts the configuration change and restores the previous configuration. This prevents the vEdge router from being isolated from the vManage controller and the rest of the SD-WAN fabric2.

References:

• : Software Upgrade for vEdge Routers - Viptela Documentation
• : Configuration Rollback - Viptela Documentation