The answer is that the DR on GigabitEthernet0/0 is 10.1.1.1. This conclusion is drawn directly from the "show ip pim interface" output, where the DR column lists the designated router for each interface; for GigabitEthernet0/0, that IP is 10.1.1.1, and since the router has two PIM neighbors on that link, the DR is the neighbor with the highest IP or priority, not the local router. On the ENCOR 350-401 exam, interpreting this command tests your understanding of PIM operation on multi-access networks, where the DR is responsible for forwarding multicast traffic to non-DR routers. A common trap is assuming the local router is always the DR, but the output clearly shows the DR IP differs from the router’s own loopback IP (10.3.3.3). Remember the memory tip: "DR is the highest IP or priority, not your own box"—check the DR column, not the interface IP.
350-401 IP Multicast Practice Question
This 350-401 practice question tests your understanding of ip multicast. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer issues the following command on Router R5:
R5# show ip pim interface
Interface PIM Nbrs Hello DR DR
Count Intvl Prior
GigabitEthernet0/0 on 2 30 1 10.1.1.1
GigabitEthernet0/1 on 1 30 1 10.2.2.2
Loopback0 on 0 30 1 10.3.3.3
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The DR on GigabitEthernet0/0 is 10.1.1.1.
The 'show ip pim interface' output shows that GigabitEthernet0/0 has 2 PIM neighbors, a hello interval of 30 seconds, DR priority of 1, and the DR is 10.1.1.1. GigabitEthernet0/1 has 1 neighbor and its DR is 10.2.2.2. Loopback0 has no neighbors and its DR is the router's own IP. The correct answer is that the DR on GigabitEthernet0/0 is 10.1.1.1, which is not the local router (since the local router's IP is not shown, but it is likely different).
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 DR is 10.2.2.2, which may or may not be the local router; the output does not indicate the local router's IP.
✗
PIM is disabled on Loopback0.
Why it's wrong here
The interface shows 'on', meaning PIM is enabled.
✗
The hello interval on GigabitEthernet0/0 is 60 seconds.
Why it's wrong here
The hello interval is 30 seconds as shown.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Trap categories for this question
Command / output trap
The DR is 10.2.2.2, which may or may not be the local router; the output does not indicate the local router's IP.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-401 OSPF questions on adjacency and route selection.
IP Multicast — This question tests IP Multicast — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The DR on GigabitEthernet0/0 is 10.1.1.1. — The 'show ip pim interface' output shows that GigabitEthernet0/0 has 2 PIM neighbors, a hello interval of 30 seconds, DR priority of 1, and the DR is 10.1.1.1. GigabitEthernet0/1 has 1 neighbor and its DR is 10.2.2.2. Loopback0 has no neighbors and its DR is the router's own IP. The correct answer is that the DR on GigabitEthernet0/0 is 10.1.1.1, which is not the local router (since the local router's IP is not shown, but it is likely different).
What should I do if I get this 350-401 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-401 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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