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| Section | Objectives |
|---|---|
| Topic 1: MPLS and Service Provider Technologies | - VPN services
|
| Topic 2: Service Provider Architecture & Junos Fundamentals | - Service provider network design basics
|
| Topic 3: OSPF and IS-IS Routing Protocols | - OSPF configuration and troubleshooting
|
| Topic 4: Troubleshooting and Operations | - Performance and monitoring
|
| Topic 5: BGP and Routing Policy | - Routing policy control
|
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NEW QUESTION # 42
Exhibit:
user@R1> show route 10.16.2.0/23 exact detail
inet.0: 12 destinations, 12 routes (11 active, 0 holddown, 1 hidden)
10.16.2.0/23 (1 entry, 1 announced)
*Aggregate Preference: 130
Next hop type: Reject
Address: 0x8f3fd44
Next-hop reference count: 2
State: <Active Int Ext>
Age: 1:39:21
Task: Aggregate
Announcement bits (1): 0-KRT
AS path: I (LocalAgg)
Flags: Depth: 0 Active
AS path list:
AS path: I Refcount: 2
Contributing Routes (2):
10.16.2.0/24 proto Direct
10.16.3.0/24 proto Direct
Which destination IP address will be matched by the aggregate route shown in the exhibit?
Answer: D
Explanation:
In the Juniper Networks Junos operating system,aggregate routesare used to represent a group of more specific routes with a single, shorter prefix. This technique is essential for reducing the size of routing tables and minimizing the volume of routing updates sent to neighbors. According to Juniper technical documentation, for a destination IP address to "match" a specific route, it must fall within the range defined by the network address and its associated CIDR mask.
The provided exhibit shows a detailed lookup for the aggregate route$10.16.2.0/23$. To determine the range of IP addresses covered by a $/23$ mask, we examine the binary representation of the third octet. A $/23$ mask means the first 23 bits are fixed. For the address $10.16.2.0$:
* The first two octets ($10.16$) are fixed.
* The third octet ($2$) is $00000010$ in binary.
* The 23rd bit is the second-to-last bit of this octet.
* The $/23$ range allows the 24th bit (the last bit of the third octet) and all 8 bits of the fourth octet to vary.
This results in a range where the third octet can be either $2$ ($00000010$) or $3$ ($00000011$). Therefore, the aggregate route $10.16.2.0/23$ covers all IP addresses from$10.16.2.0$ to $10.16.3.255$. The exhibit further confirms this by listing the "Contributing Routes": $10.16.2.0/24$ and $10.16.3.0/24$.
Analyzing the provided options against this range:
* 10.16.3.79 (Option A):This address falls squarely within the $10.16.2.0$ to $10.16.3.255$ range.
* 10.16.0.4 (Option B):This address falls in the $10.16.0.0/23$ range ($0.0$ to $1.255$).
* 10.16.4.183 (Option C):This address falls in the $10.16.4.0/23$ range ($4.0$ to $5.255$).
* 10.16.1.214 (Option D):This address also falls in the $10.16.0.0/23$ range.
Consequently,10.16.3.79is the only destination listed that matches the aggregate route shown. It is also important to note theNext hop type: Rejectin the exhibit; this means that if a packet matches the aggregate but does not match any of the more specific contributing routes, the router will drop the packet and send an ICMP unreachable message to the source.
NEW QUESTION # 43
Referring to the exhibit, you have an established RSVP LSP between R1 and R4 when you experience a link failure between R2 and R3.
Which two statements are correct? (Choose two.)
Answer: A,C
Explanation:
Upon a link failure in an RSVP-signaled LSP, the router upstream of the failure (R2) sends a PathTear message upstream to the ingress router (R1), and the router downstream of the failure (R3) sends a ResvTear message downstream to the egress router (R4). These messages signal the failure and initiate tear down of the LSP state in the respective directions.
NEW QUESTION # 44
You are adding an IPv6 configuration to an Interface on a Junos device. In this scenario, which statement is correct?
Answer: A
Explanation:
IPv6 link-local addresses are automatically generated for each interface and have a prefix of fe80::/10. The interface's MAC address is typically used as part of the process to create the Interface Identifier (IID) in the link-local address, following the EUI-64 format.
NEW QUESTION # 45
How are routing loops prevented in internal BGP networks?
Answer: B
Explanation:
The prevention of routing loops within an Autonomous System (AS) is handled differently than loop prevention between ASes. While External BGP (EBGP) uses the AS_PATH attribute to detect loops,Internal BGP (IBGP)does not modify the AS_PATH. Therefore, a different mechanism is required to ensure that a route does not circulate infinitely inside the network.
This mechanism is known as theIBGP Split Horizon rule. According to Juniper Networks documentation and the BGP standard (RFC 4271), a BGP speakermust not advertise a route learned via an IBGP peer to any other IBGP peer. In simpler terms, "what is learned internally, stays local." This rule ensures that a route only travels one "hop" inside the AS-from the router that learned it from an external source to all other internal routers.
Because of this rule, IBGP routers do not naturally propagate routes through each other. This creates a requirement for afull meshof IBGP sessions, where every BGP-speaking router in the AS must have a direct peering session with every other BGP-speaking router. To mitigate the scaling issues of a full mesh in large service provider networks, architects useRoute ReflectorsorConfederations, which are authorized exceptions to the Split Horizon rule.
Option B is incorrect because EBGP peersdoadvertise EBGP routes to other EBGP peers (this is how the internet works). Option C is incorrect because EBGP-learned routesmustbe sent to IBGP peers so the internal network knows how to reach the outside world. Option D is incorrect because internal routesmustbe sent to external peers to advertise your network to the internet.
NEW QUESTION # 46
Click the Exhibit button. Referring to the exhibit, which two statements are true? (Choose two.)
Answer: B,D
Explanation:
The configuration places the interface in VLAN membership for VLAN ID 10, meaning it is part of the VLAN that uses VLAN ID 10. With ethernet-switching and VLAN membership specified, the port expects frames associated with that VLAN, which are carried as tagged frames for that VLAN.
NEW QUESTION # 47
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