When running symmetric Integrated Routing and Bridging (IRB) with two Virtual Forwarding Routers (VFRs), BGP must be configured twice. Each VFR will have its own BGP instance to handle the routing information.
References:
* Dell Technologies SONiC Routing Guide
* Dell Networking Configuration Guide

The ztp enable command is used to administratively enable the Zero Touch Provisioning (ZTP) process on the switch. This process allows the switch to automatically download and apply configuration files upon boot-up without manual intervention. The show ztp status command is used to check on the progress and status of the ZTP process, providing information about whether the process is active, completed, or encountered any issues.
References:
* Dell Technologies SONiC documentation
* Dell Networking Configuration Guide

see the explanation 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 References:
* 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.
References:
* 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.

The output of the command show qos wred-policy pfc34 shows the ECN (Explicit Congestion Notification) configuration for the policy pfc34. The line ecn: ecn_all indicates that ECN is enabled for all traffic classes (all DSCP values). Additionally, the green-min-threshold, green-max-threshold, and green-drop-probability settings are shown, but there is no indication of a 10% probability for marking traffic as congested. Therefore, the correct answer is B.
References:
* Dell Enterprise SONiC documentation
* Dell Technologies InfoHub

* VLAN translation is not supported on MC-LAG port channel interfaces (A): This is a restriction commonly seen in network configurations involving Multi-Chassis Link Aggregation (MC-LAG) where VLAN translation capabilities are not applied.
* Trunk or access ports can be configured as members of any VLANs that are not used as an SVLAN (B): This ensures that the VLAN configuration on trunk or access ports is flexible and does not overlap with Service VLANs (SVLANs).
* SVLAN configuration for both Q-in-Q VLAN tunneling and VLAN translation is possible on the same interface (E): This allows for complex VLAN tagging and translation configurations to be applied to the same interface, supporting advanced networking scenarios.
References:
* Dell Technologies SONiC documentation
* Dell Networking Configuration Guide