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| Section | Objectives |
|---|---|
| Topic 1: Layer 2 Switching Technologies | - Ethernet switching concepts - Spanning Tree Protocol (STP/RSTP/MSTP) - VLANs and trunking |
| Topic 2: High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
| Topic 3: Routing Policy and Filtering | - Policy statements - Route filtering and preference control |
| Topic 4: Operations and Troubleshooting | - Troubleshooting routing and switching issues - Junos CLI monitoring tools |
| Topic 5: Routing Protocols | - IS-IS overview - OSPF configuration and troubleshooting - BGP fundamentals and policy control |
| Topic 6: Network Services | - NAT concepts in Junos - Basic multicast concepts |
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NEW QUESTION # 186
An EBGP session sources its TCP connection from which IP address?
Answer: B
NEW QUESTION # 187
Click the Exhibit button. A network includes several autonomous systems that exchange routing information using BGP. Multiple BGP routes exist for the same prefix. Referring to the exhibit, which attribute would BGP use first when selecting a preferred route?
Answer: B
Explanation:
The Junos BGP path selection algorithm proceeds through a strict, ordered sequence of comparison steps, and once next-hop reachability and route preference (administrative distance) have been confirmed as equal, local preference is the very first BGP-specific path attribute evaluated in the decision process. A route carrying a higher local preference value is always chosen over a competing route to the same prefix with a lower local preference, and this comparison takes absolute precedence over every subsequent attribute in the algorithm; if local preference values differ between candidate paths, the selection process concludes at this step without ever needing to examine AS path length, origin type, or MED at all. Only when two or more competing paths share an identical local preference value does the algorithm proceed to its third step, comparing AS path length and preferring the shortest, and only after a further tie does it move on to origin type (preferring IGP-origin over EGP-origin, and EGP-origin over incomplete), followed by MED comparison (preferring the lowest value, and only among routes learned from the same neighboring AS by default). Because local preference is evaluated strictly before all three of the other listed attributes, it is the attribute BGP consults first among the choices given, making it the deciding factor in scenarios such as this exhibit where multiple autonomous systems advertise competing paths toward the same 192.168.1.0/24 prefix.
NEW QUESTION # 188
Which OSPF packet type is sent when an OSPF router detects its database is stale?
Answer: A
NEW QUESTION # 189
Which two statements are correct about VRRP? (Choose two.)
Answer: A,C
Explanation:
The virtual IP address must match on all participating devices - All routers in the same VRRP group must be configured with the same virtual IP address to provide redundancy.
The VRRP group number must match on all participating devices - All routers in the same VRRP group must have the same group number to identify the VRRP group.
NEW QUESTION # 190
Which statement describes the purpose of an integrated routing and bridging (IRB) interface on a Juniper Networks EX Series Switch?
Answer: D
Explanation:
An integrated routing and bridging interface, configured as irb.x on an EX Series switch, is the mechanism that bridges the Layer 2 and Layer 3 forwarding planes for a given bridge domain or VLAN. By assigning an irb logical unit to a VLAN and configuring an IP address on that unit, the switch gains a routable Layer 3 gateway address that hosts within that VLAN can use as their default gateway, enabling traffic destined for other subnets to be routed off the local broadcast domain. Internally, when a frame destined for the gateway's MAC address arrives on any port belonging to that VLAN, the switch's integrated circuitry hands the packet from the Layer 2 bridging domain to the Layer 3 routing engine associated with the corresponding irb interface, and vice versa for the return path - hence the name 'integrated routing and bridging.' IRB does not eliminate the need for routing instances, which remain a separate mechanism for isolating routing tables; it does not itself perform inter-VLAN switching, since switching still happens strictly within a VLAN's own broadcast domain; and it has no relationship to trunk ports, which remain necessary for carrying multiple tagged VLANs between switches. IRB is the standard method for enabling inter-VLAN routing on a single EX Series switch without an external router. Reference topics: Junos Enterprise Switching - Routing VLANs, Configuring Integrated Routing and Bridging.
NEW QUESTION # 191
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