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| Section | Objectives |
|---|---|
| Layer 2 Security | - Port security, storm control, MAC limiting - Layer 2 firewall filters - Configuration, monitoring and troubleshooting - Dynamic ARP inspection, DHCP snooping |
| IS-IS | - IS-IS concepts, levels, routing information - Configuration, monitoring and troubleshooting |
| Layer 2 Switching and VLANs | - Layer 2 switching concepts and operation - VLAN concepts, tagging, ports, native VLAN - Inter-VLAN routing - Configuration, monitoring and troubleshooting |
| Tunnels | - IP-IP, GRE, IPsec tunnels - Configuration, monitoring and troubleshooting |
| Protocol Independent Routing | - Static routes, aggregate routes - Routing policy and firewall filters - Configuration, monitoring and troubleshooting - Routing tables, routing preferences |
| High Availability | - Virtual Chassis, redundant routing engines - Configuration, monitoring and troubleshooting - Graceful restart, nonstop active routing |
| OSPF | - OSPFv2/v3 concepts, areas, LSA types - Configuration, monitoring and troubleshooting - Neighbor relationships, route calculation |
| BGP | - IBGP, EBGP, route policies - Configuration, monitoring and troubleshooting - BGP concepts, attributes, path selection |
| Spanning Tree Protocol | - STP, RSTP, MSTP concepts and operation - Configuration, monitoring and troubleshooting - Root bridge, port roles and states |
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NEW QUESTION # 54
You are asked to change the setting for the LSAs age out back to the default value. In this scenario, which time interval will accomplish this task?
Answer: A
NEW QUESTION # 55
The ISP1.inet.0 route table has currently no routes in it.
What will happen when you commit the configuration shown on the exhibit?
Answer: B
Explanation:
The configuration shown in the exhibit is an example of a routing instance of type virtual-router. A routing instance is a collection of routing tables, interfaces, and routing protocol parameters that create a separate routing domain on a Juniper device. A virtual-router routing instance allows administrators to divide a device into multiple independent virtual routers, each with its own routing table.
The configuration also includes a rib-group statement, which is used to import routes from one routing table to another. A rib-group consists of an import-rib statement, which specifies the source routing table, and an export-rib statement, which specifies the destination routing table. In this case, the rib-group name is inet-to-ispi, and the import-rib statement specifies inet.0 as the source routing table. The export-rib statement specifies ispi.inet.0 as the destination routing table.
This means that the routes from inet.0 will be imported into ispi.inet.0.
NEW QUESTION # 56
Exhibit
You have configured a GRE tunnel. To reduce the risk of dropping traffic, you have configured a keepalive OAM probe to monitor the state of the tunnel; however, traffic drops are still occurring.
Referring to the exhibit, what is the problem?
Answer: A
Explanation:
Explanation
A keepalive OAM probe is a mechanism that can be used to monitor the state of a GRE tunnel and detect any failures in the tunnel path. A keepalive OAM probe consists of sending periodic packets from one end of the tunnel to the other and expecting a reply. If no reply is received within a specified time, the tunnel is considered down and the line protocol of the tunnel interface is changed to down1.
To configure a keepalive OAM probe for a GRE tunnel, you need to specify two parameters: the keepalive-time and the hold-time. The keepalive-time is the interval between each keepalive packet sent by the local router. The hold-time is the maximum time that the local router waits for a reply from the remote router before declaring the tunnel down2.
According to the Juniper Networks documentation, the hold-time value must be two times the keepalive-time value for a GRE tunnel2. This is because the hold-time value must account for both the round-trip time of the keepalive packet and the processing time of the remote router. If the hold-time value is too small, it may cause false positives and unnecessary tunnel flaps.
In the exhibit, the configuration shows that the keepalive-time is set to 10 seconds and the hold-time is set to
15 seconds for the gr-1/1/10.1 interface. This means that the local router will send a keepalive packet every 10 seconds and will wait for 15 seconds for a reply from the remote router. However, this hold-time value is not two times the keepalive-time value, which violates the recommended configuration. This may cause traffic drops if the remote router takes longer than 15 seconds to reply.
Therefore, option D is correct, because the hold-time value must be two times the keepalive-time value for a GRE tunnel. Option A is incorrect, because BFD is not required for GRE tunnels; BFD is another protocol that can be used to monitor tunnels, but it is not compatible with GRE keepalives3. Option B is incorrect, because the "event link-adjacency-loss" option is not related to GRE tunnels; it is an option that can be used to trigger an action when a link goes down4. Option C is incorrect, because LLDP does not need to be removed from the gr-1/1/10.1 interface; LLDP is a protocol that can be used to discover neighboring devices and their capabilities, but it does not interfere with GRE tunnels5.
References:
1: Configuring Keepalive Time and Hold time for a GRE Tunnel Interface 2: keepalive | Junos OS | Juniper Networks 3: Configuring Bidirectional Forwarding Detection 4: event link-adjacency-loss | Junos OS | Juniper Networks 5: Understanding Link Layer Discovery Protocol
NEW QUESTION # 57
You need to configure a LAG between your switches. In this scenario, which two statements are correct? (Choose two.)
Answer: B,C
Explanation:
Up to 64 Ethernet interfaces can be grouped to form a LAG, and In a Junos Fusion, up to 1,000 LAGs are supported on QFX10002 switches acting as aggregation devices.
The LAG must be configured on both sides of the link.
The interfaces on either side of the link must be set to the same speed and be in full-duplex mode.
NEW QUESTION # 58
You are using tunnels in your network. It is important that the routes be specific enough to ensure that the tunnels are established. You need to prevent a route that is new to the network from being used. In this scenario, which type of route should be used?
Answer: A
NEW QUESTION # 59
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