AZ-800 ExpressRoute Circuit Configuration 5 — Questions and Answers
Question 1: What is the maximum number of IP prefixes that can be advertised from on-premises to Azure over an ExpressRoute private peering connection?
- 100
- 200
- 1000
- 4000 (Correct answer)
Correct answer: 4000
ExpressRoute private peering supports advertising up to 4,000 IP prefixes from on-premises to Azure; exceeding this limit will drop the BGP session.
Question 2: You need to configure ExpressRoute for a connection that uses the provider's MPLS network. The provider uses the same BGP AS number for all customer connections. Which BGP feature must be enabled on the customer router to handle this scenario?
- BGP Route Reflector
- BGP AS Path Prepending
- BGP Allow-AS-In (Correct answer)
- BGP Next-Hop-Self
Correct answer: BGP Allow-AS-In
BGP Allow-AS-In must be configured when the provider's MPLS network uses the same AS number, allowing the router to accept routes with its own AS in the path.
Question 3: Which ExpressRoute peering type should be used to access Azure Storage and Azure SQL Database via private IP addresses within a VNet using Private Endpoints?
- Microsoft Peering
- Azure Private Peering (Correct answer)
- Public Peering (deprecated)
- Either Microsoft Peering or Private Peering
Correct answer: Azure Private Peering
Azure Private Peering is used to access resources via their private IP addresses, including Private Endpoints for PaaS services like Storage and SQL.
Question 4: When configuring ExpressRoute private peering, which VLAN ID range is valid for the primary and secondary link VLAN tags?
- 1-100
- 1-1000
- 1-4094 (Correct answer)
- 100-4094
Correct answer: 1-4094
VLAN IDs for ExpressRoute primary and secondary links must be in the range 1-4094, and each VLAN ID must be unique across all peerings on the circuit.
Question 5: An organization wants to use a single ExpressRoute circuit to access both Azure private resources and Microsoft 365 services. What must they configure?
- Two separate ExpressRoute circuits — one for each peering type
- Private Peering and Microsoft Peering on the same circuit (Correct answer)
- ExpressRoute Premium with Global Reach enabled
- A split-tunnel VPN alongside ExpressRoute
Correct answer: Private Peering and Microsoft Peering on the same circuit
A single ExpressRoute circuit can have both Azure Private Peering and Microsoft Peering configured simultaneously to access both types of resources.
Question 6: What is the effect of setting the 'Allow classic operations' property on an ExpressRoute circuit?
- Enables connection to classic virtual networks using the old deployment model (Correct answer)
- Allows the circuit to use legacy BGP routing protocols
- Enables support for older TLS versions on the connection
- Allows ExpressRoute circuits to span classic and ARM resource groups
Correct answer: Enables connection to classic virtual networks using the old deployment model
The 'Allow classic operations' property enables the ExpressRoute circuit to be linked to virtual networks deployed using the classic (non-ARM) deployment model.
Question 7: You need to resize an ExpressRoute circuit bandwidth from 1 Gbps to 2 Gbps. What is true about this operation?
- Resizing always requires deleting and recreating the circuit
- Bandwidth can be increased without disruption, but decreasing requires recreation (Correct answer)
- Bandwidth changes in either direction require a maintenance window with downtime
- Both increases and decreases can be done without disruption
Correct answer: Bandwidth can be increased without disruption, but decreasing requires recreation
ExpressRoute circuit bandwidth can be increased without disruption, but decreasing bandwidth requires deleting and recreating the circuit.
AZ-800 ExpressRoute Circuit Configuration 5
What is the maximum number of IP prefixes that can be advertised from on-premises to Azure over an ExpressRoute private peering connection?