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| Section | Objectives |
|---|---|
| Topic 1: Troubleshooting and Operations | - Performance and monitoring
|
| Topic 2: MPLS and Service Provider Technologies | - MPLS fundamentals
|
| Topic 3: BGP and Routing Policy | - BGP fundamentals
|
| Topic 4: OSPF and IS-IS Routing Protocols | - IS-IS operation in service provider networks
|
| Topic 5: Service Provider Architecture & Junos Fundamentals | - Service provider network design basics
|
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NEW QUESTION # 101
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 # 102
Exhibit:
Referring to the exhibit, which two statements are correct? (Choose two.)
Answer: C,D
Explanation:
In the provided exhibit, the output of the command show spanning-tree interface for switch1 reveals critical details about the Spanning Tree Protocol (STP) operational state.
The first correct statement is thatthe switch1 device is the root bridge(Option B). This is determined by comparing the "Port ID" column with the "Designated port ID" column, as well as checking the "Designated bridge ID". In the exhibit, for every interface listed (from ge-0/0/6.0 to ge-0/0/13.0), the Port ID and the Designated port ID are identical. Furthermore, every port is in the "FWD" (Forwarding) state with the
"DESG" (Designated) role. In a Spanning Tree topology, the root bridge is the only device where all active participating interfaces serve as designated ports, as it has no need for a "Root" port role (which points toward a root bridge).
The second correct statement is thatthe bridge priority for switch1 is 32k(Option D). Looking at the
"Designated bridge ID" column, we see the value 32768.0019e2552481. In Junos and general networking standards, the Bridge ID is composed of a bridge priority and the device's MAC address. The default priority for most Spanning Tree variants (STP, RSTP, MSTP) is 32,768, which is commonly referred to in shorthand as "32k".
Regarding the incorrect options:
* Option A:There is no evidence of VSTP (VLAN Spanning Tree Protocol); the output shows "instance
0," which is typical for IEEE standard RSTP or STP.
* Option C:The Port IDs for ge-0/0/8, ge-0/0/9, and ge-0/0/11 all start with "32" (e.g., 32:521), whereas the default port priority is typically 128 (as seen in ge-0/0/6.0 with 128:519). This indicates that the interface priorities for these specific ports have been manually tuned to a non-default value.
NEW QUESTION # 103
Referring to the exhibit, what does the configuration achieve on the ge-0/0/3 interface?
Answer: B
NEW QUESTION # 104
You are using EBGP to connect to two upstream peers in the same AS. You want to make one of the links less preferred for traffic entering your network from the peer's AS. Which feature should you use to achieve this goal?
Answer: A
Explanation:
In the world of BGP, controllinginbound traffic(traffic entering your network) is significantly more challenging than controlling outbound traffic because it requires influencing a decision made by an external Autonomous System (AS). According to Juniper Networks documentation, when you have multiple links to the same AS or even different ASes, the BGP path selection process is used by the upstream neighbor to decide which path to take to reach your prefixes.
AS-Path Prependingis the standard technique used to make a path appear less attractive to external peers. By artificially lengthening the AS_PATH attribute on the BGP advertisements sent over a specific link, you exploit the BGP best-path algorithm rule that prefers a shorter AS path. When you prepend your own AS number multiple times to the update sent to the "less preferred" peer, that peer's BGP routers will see a longer path compared to the alternative link and will naturally prefer the shorter, unprepended route.
It is important to distinguish why other options are incorrect for this specific goal:
* Local Preference (Option D):This is a well-known discretionary attribute used to influenceoutbound traffic. It is not advertised to EBGP peers; therefore, your upstream neighbor cannot see your local preference settings.
* Origin Code (Option B):While the origin code (IGP, EGP, or Incomplete) is a tie-breaker in the selection process, it is rarely used for traffic engineering and lacks the granular control provided by prepending.
* Route Reflector (Option A):This is an Internal BGP (IBGP) scaling mechanism used to reduce the need for a full mesh of peers within an AS; it does not directly influence external path selection by an upstream provider.
Junos OS allows you to easily implement prepending viarouting policiesapplied as an "export" policy to the EBGP neighbor. By using the as-path-prepend action within a policy term, you can selectively degrade a path's attractiveness to manage your inbound bandwidth.
NEW QUESTION # 105
Click the Exhibit button.
Referring to the exhibit, traffic destined to which network will be sent through the tunnel?
Answer: D
Explanation:
The route for 172.20.110.0/24 shows the next hop as the tunnel interface gr-0/0/0.0. This indicates that traffic destined for that prefix will be forwarded through the tunnel. The other route uses a physical interface (ge-0/0/3.0), meaning it is not sent through the tunnel.
NEW QUESTION # 106
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