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| Section | Objectives |
|---|---|
| Border Gateway Protocol (BGP) | - Identify the concepts, operation, or functionality of BGP
|
| Multiprotocol Label Switching (MPLS) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot MPLS
|
| Open Shortest Path First (OSPF) | - Identify the concepts, operation, or functionality of OSPF
|
| Spanning Tree Protocols | - Demonstrate knowledge of how to configure, monitor, or troubleshoot Spanning Tree Protocols
|
| IPv6 | - Identify the concepts, operation, or functionality of IPv6
|
| Layer 2 Bridging or VLANs | - Identify the concepts, operation, or functionality of Layer 2 bridging for the Junos OS
|
| Intermediate System to Intermediate System (IS-IS) | - Identify the concepts, operation, or functionality of IS-IS
|
| Protocol-Independent Routing | - Demonstrate knowledge of how to configure, monitor, or troubleshoot various protocol-independent routing components
|
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問題 #11
Referring to the exhibit, which two statements are correct? (Choose two.)
答案：A,D
解題說明：
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.
問題 #12
You are evaluating BGP between two Juniper routers and the BGP session is stuck in the Idle state. What would cause this behavior?
答案：D
解題說明：
In the BGP Finite State Machine (FSM), theIdlestate is the first stage of any BGP connection. When a BGP session is "stuck" in Idle, it typically indicates that the router is unable to even begin the process of establishing a TCP connection with its neighbor. According to Juniper Networks documentation, before BGP can transition to theConnectorActivestates, it must have a valid route to the neighbor's IP address in the routing table and be able to initiate a three-way TCP handshake on port 179.
If thepeer IP address is incorrect(Option D), the router may not have a route to that destination, or it may be attempting to connect to a non-existent or unreachable host. In many Junos configurations, if the underlying IGP (OSPF/IS-IS) or static routing cannot provide reachability to the neighbor address defined in the BGP configuration, the BGP process will remain in the Idle state and periodically retry the connection.
Regarding the other options:
* The local AS number is missing (Option C):In Junos, you cannot commit a BGP configuration if the local autonomous system is not defined at either the [edit routing-options] level or within the BGP group itself. The commit check would fail before the session could even attempt to start.
* The BGP group type (Option B):Having a mismatch in group type (internal vs. external) usually results in the session reaching theOpenSentorOpenConfirmstate before failing due to an
"unacceptable AS" error in the OPEN message.
* BGP hold time (Option A):Issues with hold timers or keepalives generally cause a session that is already in theEstablishedstate to drop; they do not prevent the session from leaving the Idle state.
問題 #13
You are asked to add next-hop redundancy using VRRP for an IPv6 enabled service. The configured primary router must always be active when available, and the servers connected to the network must be able to ping their gateway. Which VRRP element is required to accomplish this requirement?
答案：C
解題說明：
InVirtual Router Redundancy Protocol (VRRP), the primary goal is to provide a highly available default gateway for end hosts. However, there is a specific operational behavior in the VRRP standard (RFC 3768
/RFC 5798) regarding how the "Virtual Router" responds to traffic destined for its own Virtual IP (VIP).
According to Juniper Networks documentation, by default, a VRRP router that is in the Master state will only respond to packets destined for the VIP if that router is theIP Address Owner(meaning its physical interface IP matches the VIP). If the router is a "non-owner" (a common configuration in many networks), it will forward traffic on behalf of the VIP but will not respond to management traffic, such asICMP Echo Requests (Pings), directed at the VIP itself.
To satisfy the requirement that "servers connected to the network must be able to ping their gateway," the accept-data (Option D)parameter must be configured. In Junos OS, the accept-data statement allows the VRRP Master to respond to traffic destined for the virtual IP address even if it is not the address owner. This includes responding to Pings and allowing other management connections like SSH or Telnet to the VIP.
Regarding the other options:
* Preempt (Option B):While preempt is often used to ensure the primary router regains control, in Junos, a router with the highest priority (255) defaults to preemptive behavior, and accept-data is specifically what solves the "pinging the gateway" requirement.
* Track (Option A):Tracking is used for failover logic but doesn't affect the ability to ping the VIP.
* Static ARP (Option C):This is unnecessary as VRRP uses a virtual MAC address to ensure hosts can resolve the VIP via standard NDP (for IPv6) or ARP (for IPv4).
問題 #14
What are three default BGP advertisement rules? (Choose three.)
答案：B,D,E
解題說明：
TheBorder Gateway Protocol (BGP)operates based on a strict set of advertisement rules designed to prevent routing loops while ensuring global reachability. These rules differ significantly depending on whether the relationship isExternal BGP (EBGP)orInternal BGP (IBGP).
1. EBGP Advertisement (Option A):In a standard EBGP scenario, a router acts as an exit/entry point for an Autonomous System. When an EBGP speaker receives a valid route from any peer (Internal or External), it will, by default, advertise that route to all of its other EBGP peers. This is the primary mechanism that allows prefixes to propagate across the global internet from one AS to another.
2. IBGP Split Horizon (Option D):
The most critical rule within an AS is theIBGP Split Horizonrule. To prevent loops within an AS, BGP dictates that a route learned from an IBGP peermust notbe advertised to any other IBGP peer. This is why BGP requires a "full mesh" of IBGP sessions or the use ofRoute Reflectorsto ensure all internal routers learn all routes. Without this rule, a route could circulate infinitely within the AS because IBGP does not update the AS_PATH attribute.
3. EBGP to IBGP Propagation (Option B):
When a router learns a route from an EBGP peer, it is permitted to advertise that route to all of its IBGP peers.
This ensures that everyone inside the network knows how to reach external destinations. However, it is important to remember that in Junos OS, theBGP Next Hopis not modified by default when sending routes to IBGP peers, often requiring a "next-hop-self" policy to ensure internal reachability.
Options C and E are incorrect because they directly contradict these fundamental BGP loop-prevention and propagation mechanisms.
問題 #15
By default, which routing table contains a list of all ingress LSPs?
答案：A
解題說明：
In the Juniper Networks Junos operating system, the management of routing information is partitioned into several distinct routing tables (RIBs), each serving a specific architectural purpose. When dealing with Multiprotocol Label Switching (MPLS), understanding the distinction between inet.0 and inet.3 is fundamental for troubleshooting and traffic engineering.
Theinet.3routing table is specifically designed to store the egress IPv4 addresses ofLabel-Switched Paths (LSPs). When an ingress router successfully establishes an LSP (via RSVP or LDP), it places the host address of the egress router (the tail-end) into the inet.3 table. This table is not used for general packet forwarding; instead, it is primarily used by theBorder Gateway Protocol (BGP)for next-hop resolution. When BGP receives a route, it checks both inet.0 and inet.3 to resolve the next hop. If a matching entry exists in inet.3, the router knows it can reach that destination via an MPLS tunnel, allowing for the encapsulation of BGP traffic within MPLS.
In contrast,inet.0is the default unicast routing table used for standard IPv4 forwarding and contains routes learned via IGPs (OSPF, IS-IS) or static routing.inet.1is utilized for multicast forwarding (MBGP), andinet.2 is typically used for Multicast Source Discovery Protocol (MSDP) or RPF checks in multicast environments.
By isolating LSP egress points in inet.3, Junos prevents MPLS-specific paths from interfering with standard IGP path selection unless the administrator explicitly chooses to merge them (e.g., using the traffic- engineering bgp-igp command). Therefore, by default, the ingress router maintains its list of reachable LSP endpoints in inet.3.
問題 #16
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