A service provider is interconnecting two MPLS networks over an IP backbone using MPLS over GRE. The provider is concerned about the maximum transmission unit (MTU) and potential packet fragmentation. What is the best practice to avoid fragmentation in this scenario?

Disable fragmentation on the physical interfaces to force the network to handle larger packets.

Use a smaller MPLS label stack to reduce the packet size.

Increase the MTU on the IP backbone to accommodate the encapsulated packets.

Set the MTU on the tunnel interfaces to account for the GRE and IP overhead, and enable path MTU discovery.

A service provider is extending a Layer 2 Ethernet segment across an IP/MPLS backbone to interconnect two data centers. The customer requires that the overlay support up to 4000 isolated broadcast domains. The team is evaluating VXLAN as the data plane. Which statement about VXLAN is correct in this context?

VXLAN uses a 24-bit VNI, providing up to 16 million unique network identifiers, and encapsulates the original Ethernet frame in UDP/IP.

VXLAN requires the underlay to be MPLS-enabled because it carries MPLS labels in the outer header.

VXLAN uses a 12-bit VLAN ID in the outer header, limiting the overlay to 4094 segments, which is sufficient for the requirement.

VXLAN encapsulates the original frame in a GRE header with a 32-bit key field that identifies the overlay segment.

Which limitation is associated with using GRE to carry MPLS traffic?

GRE adds significant encapsulation overhead and may fragment large packets

GRE requires a dedicated physical connection between endpoints

GRE tunnels cannot carry multicast traffic

GRE tunnels cannot be used with IPv6 transport

Juniper NetworksCertified Associate, Cloud

Domain 3Objective 3

Encapsulation and Tunneling (MPLS over GRE, MPLS over UDP, VXLAN, EVPN with VXLAN, GENEVE) JN0-214 Practice Questions (Page 6)

Part of the Network Virtualization domain, which makes up ~10% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~4–6 in this domain), expect 1–2 from this objective — we provide 30 practice questions to prepare you well beyond it. (estimate)

30questions here

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Questions 26–30

26expert · medium
A service provider is interconnecting two MPLS networks over an IP backbone using MPLS over GRE. The provider is concerned about the maximum transmission unit (MTU) and potential packet fragmentation. What is the best practice to avoid fragmentation in this scenario?
Select an answer first
27application · medium
A service provider is extending a Layer 2 Ethernet segment across an IP/MPLS backbone to interconnect two data centers. The customer requires that the overlay support up to 4000 isolated broadcast domains. The team is evaluating VXLAN as the data plane. Which statement about VXLAN is correct in this context?
Select an answer first
28foundation · easy
Which limitation is associated with using GRE to carry MPLS traffic?
Select an answer first
29foundation · easy
In MPLS over UDP encapsulation, which field in the UDP header is used to identify the MPLS label stack?
Select an answer first
30foundation · easy
Which tunneling protocol typically has the lowest encapsulation overhead?
Select an answer first

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Encapsulation and Tunneling (MPLS over GRE, MPLS over UDP, VXLAN, EVPN with VXLAN, GENEVE) JN0-214 Practice Questions (Page 6)

Questions 26–30

A service provider is interconnecting two MPLS networks over an IP backbone using MPLS over GRE. The provider is concerned about the maximum transmission unit (MTU) and potential packet fragmentation. What is the best practice to avoid fragmentation in this scenario?

Which limitation is associated with using GRE to carry MPLS traffic?

In MPLS over UDP encapsulation, which field in the UDP header is used to identify the MPLS label stack?

Which tunneling protocol typically has the lowest encapsulation overhead?

Keep studying — Network Virtualization