mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show dmvpn
Legend: Attrb -> S: Static, D: Dynamic, I: Incomplete N: NATed, L: Local, X: No Socket
# Entries: 2 Interface: Tunnel0, IPv4 NHRP Details
Type: Hub, NHRP Peers: 2,
# Ent Peer NBMA Addr Peer Tunnel Addr State UpDn Tm Attrb
----- --------------- --------------- ----- -------- ----- 1 192.168.1.2 10.0.0.2 UP 00:15:30 D 2 192.168.2.2 10.0.0.3 UP 00:14:20 D
Based on this output, which statement is correct?
⚠ Common exam trap
Cisco often tests the distinction between the NHRP 'Attrb' column attributes (S, D, I, N, L, X) to trick candidates into misinterpreting dynamic registrations as static or assuming that a hub output showing only hub-spoke entries implies a lack of spoke-to-spoke connectivity.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Both spoke routers have established dynamic NHRP registrations with the hub.
The output shows two dynamic (D) NHRP entries for peers 10.0.0.2 and 10.0.0.3, each with an NBMA address of 192.168.1.2 and 192.168.2.2 respectively. The 'D' attribute indicates these registrations were established dynamically via NHRP registration requests from the spoke routers to the hub, confirming that both spokes have successfully registered with the hub. This is the expected behavior for a DMVPN Phase 2 or Phase 3 hub, where spokes dynamically register their tunnel and NBMA addresses.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The DMVPN tunnel is not functioning because there are only two peers.
Why it's wrong here
Two peers is normal for a hub with two spokes.
- ✓
Both spoke routers have established dynamic NHRP registrations with the hub.
Why this is correct
The state is UP and attribute is D (dynamic).
- ✗
The hub router has static NHRP entries for the spokes.
Why it's wrong here
The entries are marked D for dynamic.
- ✗
The spokes are not able to communicate with each other.
Why it's wrong here
This output does not provide information about spoke-to-spoke communication.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
DMVPN Phase 2
DMVPN Phase 2 is an advanced Cisco routing technology that allows spoke routers to communicate directly with one another without sending traffic through a central hub, using dynamic routing protocols and multipoint GRE tunnels.
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