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| Section | Objectives |
|---|---|
| Topic 1: High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
| Topic 2: Layer 2 Switching Technologies | - VLANs and trunking - Ethernet switching concepts - Spanning Tree Protocol (STP/RSTP/MSTP) |
| Topic 3: Routing Protocols | - BGP fundamentals and policy control - OSPF configuration and troubleshooting - IS-IS overview |
| Topic 4: Operations and Troubleshooting | - Troubleshooting routing and switching issues - Junos CLI monitoring tools |
| Topic 5: Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
| Topic 6: Network Services | - NAT concepts in Junos - Basic multicast concepts |
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NEW QUESTION # 110
Refer to Exhibit:
R1 is not responding to ICMP requests sent to the VIP address.
Referring to the exhibit, which command option would you configure on the virtual address to correct this problem?
Answer: A
Explanation:
In this configuration, R1's physical interface address (10.10.10.1) is different from the VRRP virtual IP address (10.100.100.1), meaning R1 is operating as a non-owner VRRP master -- it did not originate the virtual address as one of its own real interface addresses. By default, Junos VRRP masters that do not own the virtual address will forward transit traffic destined through that address but will not process or respond to traffic addressed directly to the VIP itself, such as ICMP echo requests, Telnet, or SSH sessions aimed at 10.100.100.1. This is deliberate default behavior intended to prevent ambiguity about which physical device is answering on behalf of a shared virtual identity. To allow the master to accept and respond to packets whose destination is the virtual address itself, the accept-data statement must be explicitly configured under the vrrp- group hierarchy. Once enabled, the elected master will process locally destined traffic sent to the VIP, resolving exactly the symptom described. The track option is used for interface or route- based priority adjustment to influence mastership, advertise-interval tunes the frequency of VRRP hello advertisements, and no-preempt prevents a higher-priority router from reclaiming mastership once a lower-priority router has taken over -- none of these affect whether the master processes traffic destined to the VIP.
NEW QUESTION # 111
A GRE tunnel is experiencing fragmentation issues. You confirm that the tunnel is up and is functioning correctly. You confirm that hosts are sending 1500-byte packets. In this scenario, which statement is correct?
Answer: B
Explanation:
GRE encapsulation adds a fixed 24 bytes of overhead to every packet it carries -- 4 bytes for the GRE header itself and 20 bytes for the new outer IPv4 delivery header. When a host transmits a full 1500-byte Ethernet payload into a gr- interface, the resulting encapsulated packet becomes
1524 bytes, which exceeds the physical interface's standard 1500-byte MTU and forces fragmentation or drops if the don't-fragment bit is set. The correct remediation is to reduce the effective MTU seen by end hosts so that encapsulated packets never exceed the physical link's transmission limit. Junos automatically applies this logic to gr-logical interfaces, which default to a
1476-byte protocol MTU (1500 minus 24), but when the underlying physical interface or a manually configured path is involved, administrators must explicitly size the interface MTU to
1476 bytes to prevent post-encapsulation oversize packets. Allowing fragmentation with clear- dont-fragment is a workaround that increases CPU load and can degrade performance rather than solving the root cause, BFD addresses link-failure detection rather than MTU sizing, and ToS copying affects only the type-of-service byte, not packet length.
NEW QUESTION # 112 
Click the Exhibit button.
Devices on VLAN 5 and VLAN 7 need to communicate with each other.
Referring to the exhibit, what will satisfy this requirement?
Answer: D
Explanation:
VLAN 5 and VLAN 7 are two entirely separate Layer 2 broadcast domains, each with its own distinct IP subnet, and devices in one VLAN can never reach devices in the other through switching alone - Layer 3 routing between the two subnets is mandatory for any inter-VLAN communication to occur, regardless of how the VLANs are configured at Layer 2. On a single EX Series switch, the correct and standard mechanism for enabling this routing without an external router is to create one integrated routing and bridging (IRB) logical interface for each VLAN, assign each IRB the appropriate gateway IP address for its respective subnet (192.168.5.1 for VLAN 5's irb.5 and 192.168.7.1 for VLAN 7's irb.7, for example), and ensure routing is active on the switch so that traffic arriving at one IRB's gateway address destined for the other VLAN's subnet is routed internally between the two IRB interfaces. Attempting to bind a single family inet interface with two distinct subnet addresses via secondary addressing conflates two separate broadcast domains onto one Layer 3 interface incorrectly and is not how VLAN routing is architected in Junos. Spanning tree exists purely to prevent Layer 2 loops and has no routing function whatsoever, so configuring it cannot enable inter-VLAN reachability. Placing both VLANs on a single trunk with Multiple VLAN Registration Protocol (MVRP) only automates VLAN membership propagation across trunk links; it does not provide any Layer 3 routing capability between the VLANs either. Reference topics: Junos Enterprise Switching - Routing VLANs, Configuring IRB Interfaces for Inter-VLAN Routing.
NEW QUESTION # 113
Which two events cause a router to advertise a connected network to OSPF neighbors? (Choose two.)
Answer: A,D
Explanation:
When an OSPF adjacency is established, the router will begin to advertise its connected networks to its OSPF neighbors.
When an interface is configured with the OSPF passive option, the router will advertise the connected network but will not attempt to form OSPF adjacencies on that interface.
NEW QUESTION # 114
How many bytes of overhead does an IP-IP tunnel add to a packet?
Answer: C
NEW QUESTION # 115
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