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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q74-Q79):
NEW QUESTION # 74
Within your router, you want to verify that you are learning routes from a remote BGP peer at IP address
10.10.100.1. Which command would satisfy the requirement?
- A. show route receive-protocol bgp 10.10.100.1
- B. show route protocol bgp table inet.0 10.10.100.1
- C. show route protocol bgp source-gateway 10.10.100.1
- D. show route advertise-protocol bgp 10.10.100.1
Answer: A
Explanation:
To verify that your router islearning routes from a remote BGP peerat a specific IP address (e.g.,
10.10.100.1), the correct command to use is show route receive-protocol bgp.
Step-by-Step Breakdown:
* BGP Route Learning:The show route receive-protocol bgp command displays the routes that have been received from a specified BGP peer. This helps in confirming that the remote peer is sending routes correctly and that your router is receiving them.
* Command Example:
show route receive-protocol bgp 10.10.100.1
* This will show all routes that have been received from the BGP peer with IP address 10.10.100.1.
Juniper Reference:
* BGP Route Verification: Use this command to troubleshoot and verify that routes from a specific BGP peer are being received.
NEW QUESTION # 75
What is the first route selection mechanism for IBGP?
- A. local preference
- B. origin
- C. as path
- D. MED
Answer: A
NEW QUESTION # 76
Which static routing parameter will silently drop the packet if it is set as the next hop?
- A. Resolve
- B. Readvertise
- C. Reject
- D. Discard
Answer: D
Explanation:
When thediscardoption is configured as the next hop for a static route, it silently drops any packets that match the route without sending any notification to the sender.
Step-by-Step Breakdown:
* Discard Behavior:
* If a route uses thediscardnext hop, the router drops the packet without generating any ICMP message or error back to the sender. This is useful for creating null routes to prevent routing loops or blackhole traffic intentionally.
* Reject vs. Discard:
* Therejectnext hop, in contrast, drops the packet but sends anICMP Destination Unreachable message back to the source.
Juniper Reference:
* Static Route Behavior: In Junos, thediscardoption ensures packets matching a static route are dropped silently, providing a way to discard traffic without alerting the source.
NEW QUESTION # 77
What information in the Ethernet header is used to populate the bridging table?
- A. protocol
- B. source address
- C. type
- D. destination address
Answer: B
Explanation:
Thesource MAC addressin the Ethernet header is used to populate thebridging table(also called the MAC address table) on a switch. When a frame arrives at a switch, the switch examines the source MAC address and records it along with the ingress port in its MAC address table.
Step-by-Step Breakdown:
* Learning Process:When an Ethernet frame arrives on a switch port, the switch looks at thesource MAC addressand adds this MAC address to the MAC table along with the port it was received on.
This process is calledMAC learning.
* Purpose:The switch uses this information to determine the correct port to send frames destined for that MAC address in future transmissions, thus ensuring efficient Layer 2 forwarding.
Juniper Reference:
* Ethernet Switching: Juniper switches use source MAC addresses to build and maintain the MAC address table, which is essential for Layer 2 switching.
NEW QUESTION # 78
What does VXLAN stand for in the context of EVPN/VXLAN?
- A. Very Extended Virtual LAN
- B. Virtual X-Series LAN
- C. Virtual Extensible VLAN
- D. Virtualized Ethernet VPN
Answer: C
NEW QUESTION # 79
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