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| Section | Objectives |
|---|---|
| OSPF and IS-IS Routing Protocols | - IS-IS operation in service provider networks
|
| Troubleshooting and Operations | - Performance and monitoring
|
| BGP and Routing Policy | - BGP fundamentals
|
| MPLS and Service Provider Technologies | - MPLS fundamentals
|
| Service Provider Architecture & Junos Fundamentals | - Service provider network design basics
|
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NEW QUESTION # 154
What information is determined by using the AS path attribute included in the BGP update message? (Choose two.)
Answer: B,D
NEW QUESTION # 155
Which new field is added to an IPv6 header as compared to IPv4?
Answer: D
Explanation:
The flow label is a new field added to IPv6 headers that was not present in IPv4 headers. It is used to identify packets that require special handling by routers, particularly for quality-of-service (QoS) purposes.
NEW QUESTION # 156
Which two events cause a static route to be removed from a routing table? (Choose two.)
Answer: A,C
Explanation:
In Junos OS, astatic routeis a manually configured entry in the routing table. Unlike dynamic routes, which have built-in timers and aging mechanisms, static routes are generally "permanent" as long as their conditions for validity are met.
1. Manual Removal (Option A):
Since static routes are explicitly defined by the administrator, the most direct way to remove one is through a configuration change. Using the delete routing-options static route <prefix> command followed by a commit will immediately remove the route from the Routing Information Base (RIB).
2. Next-Hop Reachability (Option B):
For a static route to be "active" and installed in the forwarding table, itsnext-hop must be reachable. If a static route points to a specific physical interface or an IP address on a local segment, and thatoutbound interface becomes unavailable(e.g., the link goes "Down"), the Junos kernel detects that the next-hop is no longer viable. Consequently, the route is marked as "hidden" or "inactive" and is removed from the active forwarding table to prevent traffic from being black-holed.
Why other options are incorrect:
* Aging (Option C):Static routes do not have an expiration timer based on traffic. Even if no packet is sent for years, the route remains as long as the interface is up.
* Remote Reachability (Option D):Standard static routes only track the status of the local interface or the immediate next-hop. They do not possess "end-to-end" visibility. If a host two hops away fails, the local router has no way of knowing this via the static route itself. To achieve this level of tracking, features likeRPM (Real-time Performance Monitoring)orBFD (Bidirectional Forwarding Detection)must be linked to the static route.
NEW QUESTION # 157
Which two statements regarding GRE and IP-IP tunnels are correct? (Choose two.)
Answer: A,B
Explanation:
In Juniper Networks Junos OS,Generic Routing Encapsulation (GRE)andIP-in-IP (IP-IP)are common tunneling mechanisms used to transport packets across a network by encapsulating them within another protocol. Understanding the header structure and the limitations of these protocols is essential for proper MTU (Maximum Transmission Unit) management and security design.
Overhead (Option A):
Both GRE and IP-IP tunnels operate by adding an additional IP header to the original packet. An IP-IP tunnel (Protocol 4) adds a20-byteIPv4 header. A GRE tunnel (Protocol 47) adds the same20-bytedelivery IP header plus a minimum4-byteGRE header (totaling 24 bytes, which can increase if keys or sequencing are used).
Because these headers are added to the payload, the total size of the packet increases. This "overhead" means that if the original packet was already at the MTU limit (e.g., 1500 bytes), the encapsulated packet will exceed it, potentially leading to fragmentation or the need to adjust theTCP MSS (Maximum Segment Size).
Encryption (Option D):
Crucially, according to Juniper Service Provider documentation, neither GRE nor IP-IP provides native encryptionor data confidentiality. They are encapsulation protocols, not security protocols. The payload remains in cleartext and is visible to any device along the path. If security and encryption are required for data traversing these tunnels, they must be combined withIPsec (IP Security). While GRE is often used as the
"carrier" for IPsec (to allow multicast or dynamic routing protocols which IPsec alone does not support), the GRE protocol itself remains an unencrypted delivery mechanism. Therefore, statements A and D accurately describe the architectural behavior of these tunnel types.
NEW QUESTION # 158
Referring to the exhibit, which two statements are correct? (Choose two.)
Answer: B,D
Explanation:
Local preference is a BGP attribute that dictates which path is preferred when multiple paths to the same destination are available. A higher local preference is preferred over a lower one. Since ISP A (AS 65501) is advertising a local preference of 100 and ISP B (AS 65502) is advertising a local preference of 200 to AS 65512, traffic from devices in AS 65512 will prefer the path via ISP B for all networks that ISP B advertises. However, since ISP A advertises the 172.20.21.0/24 network and ISP B does not, traffic for 172.20.21.0/24 will go through ISP A. For the
172.20.0.0/24 network, which both ISPs advertise, devices in AS 65512 will prefer the path via ISP B due to the higher local preference.
NEW QUESTION # 159
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