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Juniper JN0-281 Exam Syllabus Topics:

SectionObjectives
Border Gateway Protocol (BGP)- BGP concepts, operations, and functionality
  • 1. BGP basic operations
  • 2. IBGP and EBGP functionality
  • 3. BGP message types
  • 4. Attributes
  • 5. Path selection
- Configure, monitor, or troubleshoot BGP
Protocol-Independent Routing- Configure, monitor, or troubleshoot protocol-independent routing components
  • 1. Static, aggregate, and generated routes
  • 2. Load balancing
- Protocol-independent routing components
  • 1. Static, aggregate, and generated routes
  • 2. Martian addresses
  • 3. Routing instances, including Routing Information Base (RIB) groups
  • 4. Load balancing
  • 5. Filter-based forwarding
Junos OS Fundamentals- Junos OS architecture and routing architecture
- Configuration modes and syntax
- Monitoring and operational commands
Data Center Architectures- Layer 2 and Layer 3 strategies
- IP fabric architectures (spine/leaf)
- Overlay network vs. underlay network
- Ethernet VPN–Virtual Extensible LAN (EVPN-VXLAN) basics/purpose
- Traditional architectures (multitier)
High Availability (HA)- Configure, monitor, or troubleshoot HA features
- HA concepts, operations, and functionality
  • 1. Graceful Restart
  • 2. Virtual Chassis
  • 3. Bidirectional Forwarding Detection (BFD)
Open Shortest Path First (OSPF)- Configure, monitor, or troubleshoot OSPF
- OSPF concepts, operations, and functionality
  • 1. Areas and router types
  • 2. Link-state database
  • 3. Authentication
  • 4. OSPF packet types
  • 5. Designated Router (DR) and Backup Designated Router (BDR)
Layer 2 Switching and VLANs- Configure, monitor, or troubleshoot Layer 2 switching or VLANs
  • 1. Ethernet switching/bridging
  • 2. VLANs
- VLANs concepts, benefits, and functionalities
  • 1. VLAN tagging
  • 2. Integrated Routing and Bridging (IRB)
  • 3. Port modes
- Ethernet switching/bridging concepts and operations

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q112-Q117):

NEW QUESTION # 112
Which two statements are correct about aggregate routes and generated routes? (Choose two.)

Answer: B,C

Explanation:
Aggregate routes and generated routes are used to create summarized routes in Junos, but they behave differently in terms of forwarding.
Step-by-Step Breakdown:
Aggregate Routes:
An aggregate route summarizes a set of more specific routes, but it does not have a direct forwarding next hop. Instead, it points to the more specific routes for actual packet forwarding.
Generated Routes:
A generated route also summarizes specific routes, but it has a forwarding next hop that is determined based on the availability of contributing routes. The generated route can be used to directly forward traffic.
Juniper
Reference: Aggregate and Generated Routes: In Junos, aggregate routes rely on more specific routes for forwarding, while generated routes can forward traffic directly based on their next-hop information.


NEW QUESTION # 113
When configuring static routes, which command is typically used?

Answer: C


NEW QUESTION # 114
When a MAC limiting violation occurs, the switch performs which two actions by default? (Choose two.)

Answer: A,B

Explanation:
When a MAC limiting violation occurs on a Juniper switch, the switch will perform the following actions by default:
Step-by-Step Breakdown:
Port Disabled:
When the number of MAC addresses on an interface exceeds the configured limit, the port is automatically disabled to prevent further violations. This is a protective mechanism to prevent MAC address flooding.
Packet Dropped:
Additionally, packets from the violating MAC address are dropped to prevent any further communication from that address. This ensures that only valid MAC addresses are allowed to communicate through the interface.
Example Configuration:
set ethernet-switching-options secure-access-port interface <interface-name> mac-limit 5 If more than five MAC addresses are learned, the port is disabled, and excess packets are dropped.
Juniper
Reference: MAC Limiting: When the switch detects a MAC limiting violation, it disables the port and drops further packets from the violating MAC addresses to maintain network security.


NEW QUESTION # 115
When a MAC limiting violation occurs, the switch performs which two actions by default? (Choose two.)

Answer: A,B

Explanation:
When a MAC limiting violation occurs on a Juniper switch, the switch will perform the following actions by default:
Step-by-Step Breakdown:
Port Disabled:
When the number of MAC addresses on an interface exceeds the configured limit, the port is automatically disabled to prevent further violations. This is a protective mechanism to prevent MAC address flooding.
Packet Dropped:
Additionally, packets from the violating MAC address are dropped to prevent any further communication from that address. This ensures that only valid MAC addresses are allowed to communicate through the interface.
Example Configuration:
set ethernet-switching-options secure-access-port interface <interface-name> mac-limit 5 If more than five MAC addresses are learned, the port is disabled, and excess packets are dropped.
Juniper Reference:
MAC Limiting: When the switch detects a MAC limiting violation, it disables the port and drops further packets from the violating MAC addresses to maintain network security.


NEW QUESTION # 116
Which BGP message type is used to establish peering sessions?

Answer: C


NEW QUESTION # 117
......

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