D-SNC-DY-00 Practice Questions

ECMP (Equal-Cost Multi-Path) is a Layer 3 routing feature that allows traffic to be forwarded using multiple available paths of equal cost. This improves bandwidth utilization and provides redundancy. ECMP is commonly used in modern networks to optimize the flow of traffic and increase the resiliency of network connections. Reference: Dell Technologies SONiC documentation ECMP Configuration Guide

The local timers in the BFD (Bidirectional Forwarding Detection) configuration show a detect

multiplier of 4 and a receive interval of 300ms. The time taken to detect remote failures is calculated

as detect multiplier × receive interval = 4 × 300ms = 1200ms.

Reference:

Dell Technologies SONiC documentation

BFD Configuration Guide

The automated installation of Enterprise SONiC is typically performed using the HTTP protocol.

During the Zero Touch Provisioning (ZTP) process, the switch retrieves configuration files and

software images from an HTTP server, allowing for automated and streamlined deployments.

Reference:

Dell Technologies SONiC documentation

ONIE User Guide

Configure the access mode for the switch port (A): This involves setting the switch port to operate in

access mode.

Remove the current access VLAN configuration (D): Before changing the VLAN, the current

configuration must be cleared.

Enter it into the relevant interface (E): Apply the new configuration to the specific interface, Eth1/10.

Steps:

interface Ethernet 1/10

no switchport access vlan (Remove current VLAN)

switchport mode access

switchport access vlan 40

Reference:

Dell Technologies SONiC documentation

Dell Networking Configuration Guide

Ingress VTEP performs a route lookup that is based on the destination IP address. Ingress VTEP encapsulates the packet with VXLAN and sends it on the appropriate VNI segment. Egress VTEP determines that the host is local to the VNI and switches the packet. Egress VTEP bridges the packet after decapsulation. Steps and Correct Order: Ingress VTEP performs a route lookup that is based on the destination IP address. The ingress VTEP (Virtual Tunnel Endpoint) first needs to determine the next hop for the packet. This involves performing a route lookup using the destination IP address. Ingress VTEP encapsulates the packet with VXLAN and sends it on the appropriate VNI segment. Once the route lookup is complete, the ingress VTEP encapsulates the packet in a VXLAN header, which includes the appropriate VNI (VXLAN Network Identifier) segment, and forwards it. Egress VTEP determines that the host is local to the VNI and switches the packet. The egress VTEP receives the encapsulated VXLAN packet, decapsulates it, and then checks its local VNI to determine if the destination host is within the same VNI. Egress VTEP bridges the packet after decapsulation. After determining the destination host's locality, the egress VTEP bridges the packet to the appropriate interface to deliver it to the final destination. Reference: Dell Technologies Networking - SONiC Dell Enterprise SONiC Deployment Guide These steps provide a comprehensive guide to understand the correct order of operations in asymmetric IRB (Integrated Routing and Bridging) frame encapsulation within a VXLAN environment.

To configure an access port on the SONiC CLI, the commands should be entered in the following order: Enter global configuration mode with configure terminal. Specify the interface to configure using interface ethernet 1/1. Set the interface to access mode and assign it to VLAN 20 with switchport access vlan 20. Exit the interface configuration mode with exit. Reference: Dell Technologies SONiC Command Reference Guide Dell Networking Configuration Guide

for all

step by step solution

with all explanation.

Explanation:

Here is the step-by-step configuration for R1:

Enter BGP Configuration Mode:

R1# configure terminal

R1(config)# router bgp 1

Configure the BGP Neighbor:

R1(config-router)# neighbor 10.10.12.2 remote-as 2

Redistribute Connected Routes into BGP:

R1(config-router)# redistribute connected

Exit BGP Configuration Mode and Save the Configuration:

R1(config-router)# end

R1# write memory

Comprehensive Detailed Step by Step Explanation with Reference:

Enter BGP Configuration Mode:

To configure BGP on R1, you need to enter global configuration mode and then enter BGP

configuration mode with the AS number. Since R1 is in AS 1, you use the command router bgp 1.

Configure the BGP Neighbor:

BGP neighbors must be manually specified. In this case, R1's neighbor is R2, which has an IP address

of 10.10.12.2 and resides in AS 2. The command neighbor 10.10.12.2 remote-as 2 establishes this

relationship.

Redistribute Connected Routes into BGP:

To ensure that all connected routes on R1 are advertised via BGP, you use the redistribute connected

command. This ensures that any connected IPv4 routes are redistributed into BGP, meeting the

requirement to advertise current and future connected routes.

Exit BGP Configuration Mode and Save the Configuration:

Once the configuration is complete, you exit BGP configuration mode by typing end and then save

the configuration with the write memory command. This ensures that the changes persist after a

reboot.

Reference:

Cisco BGP Configuration Guide

Dell Technologies Networking - SONiC

Dell Enterprise SONiC Deployment Guide

These steps provide a comprehensive guide to configure R1 to meet the specified requirements for

BGP peering and route redistribution.

for all

step by step solution

with all explanation.

Explanation:

Here are the steps to configure the required VLAN translations on a Dell SONiC switch:

Map a Single-Tagged CVLAN 100 to SVLAN 200 on Interface Eth1/1:

sonic# configure terminal

sonic(config)# interface Ethernet1/1

sonic(config-if-Ethernet1/1)# switchport mode trunk

sonic(config-if-Ethernet1/1)# switchport vlan mapping 100 200

sonic(config-if-Ethernet1/1)# end

sonic# write memory

Map a Double-Tagged VLAN Packet with Outer CVLAN 100 and Inner dot1q 200 to SVLAN 300 on

Interface Eth1/2:

sonic# configure terminal

sonic(config)# interface Ethernet1/2

sonic(config-if-Ethernet1/2)# switchport mode trunk

sonic(config-if-Ethernet1/2)# switchport vlan mapping 100 200 300

sonic(config-if-Ethernet1/2)# end

sonic# write memory

Comprehensive Detailed Step by Step Explanation with Reference:

Enter Configuration Mode:

Access the global configuration mode using the configure terminal command.

Configure Interface Eth1/1:

Enter interface configuration mode for Ethernet1/1 using the command interface Ethernet1/1.

Set the switchport mode to trunk with the command switchport mode trunk.

Configure the VLAN translation using the switchport vlan mapping 100 200 command, which maps

CVLAN 100 to SVLAN 200.

Exit the interface configuration mode by typing end.

Save the configuration with write memory.

Configure Interface Eth1/2:

Enter interface configuration mode for Ethernet1/2 using the command interface Ethernet1/2.

Set the switchport mode to trunk with the command switchport mode trunk.

Configure the double-tagged VLAN translation using the switchport vlan mapping 100 200 300

command, which maps packets with outer CVLAN 100 and inner dot1q 200 to SVLAN 300.

Exit the interface configuration mode by typing end.

Save the configuration with write memory.

Reference:

Dell Technologies Networking - SONiC

Dell Enterprise SONiC Deployment Guide

These steps provide a comprehensive guide to configure VLAN translations on a Dell SONiC switch,

ensuring that the specific requirements for single-tagged and double-tagged VLAN mappings are

met.

for all

step by step solution

with all explanation.

Explanation:

Here are the steps to create the VTEP and map the VNI to the VLAN:

Enter Configuration Mode:

SwitchA# configure terminal

Create VTEP Interface:

SwitchA(config)# interface vtep1

SwitchA(config-if-vtep1)# ip address 10.10.10.1/24

SwitchA(config-if-vtep1)# exit

Map VNI 400 to VLAN 40:

SwitchA(config)# vlan 40

SwitchA(config-vlan)# vn-segment 400

SwitchA(config-vlan)# exit

Enable ARP Neighbor Suppression:

SwitchA(config)# interface Vlan40

SwitchA(config-if-Vlan40)# ip address 192.168.40.254/24

SwitchA(config-if-Vlan40)# vxlan arp-suppression

SwitchA(config-if-Vlan40)# exit

Save Configuration:

SwitchA# write memory

Enter Configuration Mode:

Begin by entering the global configuration mode to make changes to the switch configuration.

Create VTEP Interface:

Enter the interface configuration mode for the VTEP interface named vtep1 using interface vtep1.

Assign the IP address 10.10.10.1/24 to the VTEP interface using the ip address command.

Exit the interface configuration mode.

Map VNI 400 to VLAN 40:

Enter the VLAN configuration mode for VLAN 40 using vlan 40.

Map the VNI 400 to VLAN 40 using the vn-segment 400 command.

Exit the VLAN configuration mode.

Enable ARP Neighbor Suppression:

Enter the interface configuration mode for VLAN 40 using interface Vlan40.

Assign the anycast IP address 192.168.40.254/24 to the VLAN interface using the ip address

command.

Enable ARP neighbor suppression using the vxlan arp-suppression command.

Exit the interface configuration mode.

Save Configuration:

Save the configuration to ensure the changes persist after a reboot using the write memory

command.

Reference:

Dell Technologies Networking - SONiC

Dell Enterprise SONiC Deployment Guide

These steps provide a comprehensive guide to configure a VTEP and map the VNI to VLAN 40 on

Switch A, ensuring the specific requirements for IP addressing and ARP neighbor suppression are

met.

Route maps in Enterprise SONIC are used for controlling and modifying routing information. They

contain a series of commands with matching criteria and actions. The permit or deny clause within

route maps determines whether the matching routes are permitted or denied from being

redistributed.

Reference:

Dell Technologies SONiC Route Map Configuration Guide

Dell Networking Configuration Guide