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| Section | Objectives |
|---|---|
| Layer 2 Bridging or VLANs | - Identify the concepts, operation, or functionality of Layer 2 bridging for the Junos OS
|
| Protocol-Independent Routing | - Identify the concepts, operation, or functionality of various protocol-independent routing components
|
| Spanning Tree Protocols | - Identify the concepts, operation, or functionality of STP
|
| Multiprotocol Label Switching (MPLS) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot MPLS
|
| Border Gateway Protocol (BGP) | - Identify the concepts, operation, or functionality of BGP
|
| IPv6 | - Identify the concepts, operation, or functionality of IPv6
|
| Open Shortest Path First (OSPF) | - Identify the concepts, operation, or functionality of OSPF
|
| Intermediate System to Intermediate System (IS-IS) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot IS-IS
|
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NEW QUESTION # 88
What is the default export behavior of IS-IS in the Junos OS?
Answer: A
Explanation:
In Junos OS, IS-IS does not automatically export routes from the routing table into the IS-IS protocol. By default, no routes are advertised into IS-IS unless an explicit export policy is configured to control which prefixes should be advertised.
NEW QUESTION # 89
What information is determined by using the AS path attribute included in the BGP update message? (Choose two.)
Answer: A,C
NEW QUESTION # 90
Referring to the exhibit, which two statements are correct? (Choose two.)
Answer: B,D
Explanation:
In IS-IS, Level 1 routes are usually contained within the same area and Level 2 routes are used to interconnect different areas. By default, routes from Level 1 are redistributed into Level 2, and vice versa, to ensure reachability between areas.
By default, IS-IS protocol leaks routing information from a Level 1 area to a Level 2 area.
However, to leak routing information from a Level 2 area to a Level 1 area, an export policy must be explicitly configured.
NEW QUESTION # 91
Which IS-IS packet type will establish and maintain neighbor relationships?
Answer: C
Explanation:
In theIS-IS (Intermediate System to Intermediate System)protocol, communication between routers is performed usingProtocol Data Units (PDUs). To discover neighbors and maintain adjacencies, IS-IS relies on theHello PDU (IIH - IS-IS Hello).
According to Juniper Networks technical documentation, when IS-IS is enabled on an interface, the router begins transmitting Hello PDUs to a multi-destination address (multicast). These PDUs contain essential information such as the router'sSystem ID, its configuredArea Addresses, and itsLevel capability(Level 1, Level 2, or both). For two routers to become neighbors, they must exchange these Hello PDUs and agree on specific parameters, such as the MTU of the link and the hello/hold timers.
Once an adjacency is established, the Hello PDU serves as a "keepalive" mechanism. If a router stops receiving Hello PDUs from a neighbor for a duration exceeding theHolding Time, it assumes the neighbor is down and flushes the associated Link-State PDUs (LSPs) from its database.
To clarify the other options:
* Link-State PDU (Option A):These are used to distribute actual topology and reachability information, not to form adjacencies.
* Partial Sequence Number PDU (Option C):PSNPs are used on point-to-point links to acknowledge the receipt of LSPs or to request missing LSPs.
* Update PDU (Option D):This is not a standard IS-IS term; in IS-IS, updates are handled via the flooding of LSPs.
NEW QUESTION # 92
Which two statements regarding GRE and IP-IP tunnels are correct? (Choose two.)
Answer: B,D
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 # 93
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