Junos OS Quiz: Forwarding Table Components

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Questions and Answers

In Junos OS, what symbol indicates the active route being used to forward traffic?

+ (correct)

Which component is responsible for maintaining the forwarding table in Junos OS?

Management Daemon

Chassis Control Daemon

Routing Engine

Packet Forwarding Engine (correct)

What factors does the routing protocol's decision process take into account in Junos OS?

Route preference and metrics only

Route preference and metrics (correct)

Route preference, metrics, and hop count

Route preference, metrics, and bandwidth

What is the purpose of the Packet Forwarding Engine (PFE) in Junos OS?

Processing incoming packets and performing route lookups Signup and view all the answers

What happens when there are two entries for the same route in the routing table in Junos OS?

The routing protocol's decision process selects an active route Signup and view all the answers

What is the role of the Routing Engine in Junos OS?

Managing the routing table Signup and view all the answers

What is required to advertise a default static route into OSPF on R1?

a routing policy Signup and view all the answers

What is the primary purpose of a routing policy?

To determine how routes are imported into or exported from the routing table Signup and view all the answers

What is the default action for packets that are not explicitly allowed in a firewall filter?

Discard Signup and view all the answers

What is the result of advertising a default static route into OSPF on R1?

All OSPF routers in the network can use R1 as a gateway to reach the Internet Signup and view all the answers

Where is the routing policy applied in the OSPF configuration on R1?

Under the export section of the OSPF configuration Signup and view all the answers

What is the purpose of configuring multiple firewall filters on a Juniper Networks device?

To apply different security policies to different interfaces Signup and view all the answers

What is the default action for packets that do not match any of the specified criteria in the firewall filter?

Discard them Signup and view all the answers

What can be configured on a Juniper Networks device to control packet flow?

Multiple firewall filters Signup and view all the answers

Referring to the exhibit, what is the metric for the OSPF route?

1 Signup and view all the answers

Which protocol is announcing the route 192.168.100.2/32?

Both BGP and OSPF Signup and view all the answers

What is the purpose of firewall filters in Juniper Networks devices?

To enhance network security by allowing only explicitly allowed traffic Signup and view all the answers

Study Notes

OSPF and Routing Tables in Junos OS

The "+" symbol indicates an active route in the OSPF routing table for 192.168.100.2/32.
OSPF is preferred over BGP for forwarding traffic due to its routing decision process, which considers factors like administrative distance and metrics.

Packet Forwarding Engine (PFE)

The PFE is responsible for maintaining the forwarding table in Junos OS.
It handles packet processing and route lookups, offloading tasks from the Routing Engine for efficient packet forwarding.

Advertising Default Static Routes in OSPF

A routing policy is needed to advertise a default static route (0.0.0.0/0) into OSPF on router R1.
The routing policy matches the default route and sets it as an OSPF external type for redistribution into the OSPF domain.

Firewall Filters

Default action for unmatched packets in firewall filters is "discard," enhancing network security.
Multiple firewall filters can be configured on a device, allowing for detailed traffic control based on various criteria.

Route Show Output Interpretation

In the provided route output, there are 15 active routes, with the OSPF route for 192.168.100.2/32 being the only active route due to the "+" symbol.
BGP is present but not preferred, as indicated by the absence of the "+" symbol, confirming that the OSPF path is the active route.

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Description

Identify the active route in a Junos OS routing table. Learn how to interpret route symbols in Junos OS.

Junos OS Routing Table

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