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| Section | Objectives |
|---|---|
| Intermediate System to Intermediate System (IS-IS) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot IS-IS
|
| Protocol-Independent Routing | - Identify the concepts, operation, or functionality of various protocol-independent routing components
|
| Layer 2 Bridging or VLANs | - Identify the concepts, benefits, or functionality of VLANs
|
| Spanning Tree Protocols | - Demonstrate knowledge of how to configure, monitor, or troubleshoot Spanning Tree Protocols
|
| Open Shortest Path First (OSPF) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot OSPF
|
| Multiprotocol Label Switching (MPLS) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot MPLS
|
| IPv6 | - Demonstrate knowledge of how to configure, monitor, or troubleshoot IPv6 - Identify the concepts, operation, or functionality of IPv6
|
| Border Gateway Protocol (BGP) | - Identify the concepts, operation, or functionality of BGP
|
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質問 # 16
A service provider is onboarding a new enterprise customer that operates multiple branch offices, each with its own set of VLANs. The customer requires transparent Layer 2 connectivity between sites while maintaining separation of internal VLANs. The provider must also ensure that customer VLAN identifiers do not conflict with other customers on the shared infrastructure. Which solution would provide the desired results?
正解：C
解説：
In a service provider environment,Q-in-Q tunneling(also known as 802.1ad or double-tagging) is the standard solution for transporting multiple customer VLANs over a shared provider backbone while maintaining total separation.
According to Juniper Networks documentation, Q-in-Q works by adding a second 802.1Q tag (theService Provider tagor S-tag) to the customer's already tagged frames (theCustomer tagor C-tag). This creates a
"tunnel" at Layer 2. This solution specifically addresses all the customer's requirements:
* Transparent Layer 2 Connectivity:Because the provider simply encapsulates the customer's frames, the customer's internal BPDU traffic (like Spanning Tree) and VLAN tags are preserved and delivered transparently to the remote site.
* Separation of Internal VLANs:The customer can run their own internal VLAN IDs (1-4094) without the provider needing to know or manage them.
* Conflict Avoidance:Different customers on the same provider infrastructure are assigned unique S- tags. Even if two different customers both use "VLAN 10" internally, they remain isolated because their traffic is encapsulated in different provider S-tags.
Why other options are incorrect:
* Layer 3 VPN (Option B):While MPLS L3VPNs are common, they provide Layer 3 (IP) connectivity, not the "transparent Layer 2" connectivity requested.
* GRE Tunnels (Option C):GRE is a Layer 3 encapsulation and does not natively provide the transparent VLAN bridging required for a multi-site Layer 2 service.
* NAT/Firewall (Option D):These are security and address-translation services for internet access and do not facilitate site-to-site Layer 2 bridging.
質問 # 17
Referring to the exhibit, internal BGP between R1 and R2 is not establishing.
What is the problem In this scenario?
正解：D
解説：
The exhibit shows that the BGP session state is "Active," which generally indicates that the router is trying to establish a BGP session but has not received a response. One common cause for this issue is that there is no route to the BGP neighbor's address. Since the routers are using internal BGP (iBGP) and they are in the same AS, the AS number does not need to be unique, and a next-hop self policy is not strictly required for iBGP. The router-id is usually automatically determined and does not need to be explicitly set.
質問 # 18
Referring to the exhibit. Which two statements ate correct about the actions taken as the packet traverses the service provider MPLS network from Site 1 to Site 2 as shown in the exhibit?
(Choose two.)
正解：B、C
解説：
In MPLS (Multiprotocol Label Switching) networks, routers use label switching to forward packets.
The first router at the edge of the MPLS network (R1) will perform a lookup in the mpls.0 table to determine the label to attach to the packet as it enters the MPLS network. This label informs the next routers in the MPLS network (like R2) on how to forward the packet. Internal MPLS routers, like R2, also perform lookups in their mpls.0 table to determine how to switch the packet toward its destination (label swapping). The inet.3 table is used for resolving next-hop information for labeled routes, but it's the mpls.0 table that is used for label switching decisions.
質問 # 19
What are three extension headers supported by IPv6? (Choose three.)
正解：A、B、C
解説：
One of the most significant architectural improvements in IPv6 is the move from a complex, variable-length header (as seen in IPv4) to a streamlined, fixed-length base header of 40 bytes. Additional functionality that was previously handled by "Options" in IPv4 is now moved toExtension Headers, which are inserted between the IPv6 base header and the upper-layer protocol (TCP/UDP).
According to Juniper Networks technical documentation and RFC 8200, the following are valid IPv6 Extension Headers:
* Hop-by-Hop Options (Option B):This header carries optional information that must be examined by every node along the delivery path. It is used for features like the Router Alert and Jumbo Payload options.
* Fragment (Option E):Unlike IPv4, where any router can fragment a packet, in IPv6, fragmentation is performed only by the source node. The Fragment header contains the information necessary for the destination to reassemble the packet (Offset, Identification, and More Fragments flag).
* Destination Options (Option A):This header carries information intended only for the destination node. It can appear twice: once before a routing header and once after.
Why other options are incorrect:
* Protocol (Option C):In IPv4, this was a field in the header. In IPv6, this is replaced by theNext Header field, which identifies the type of the following header (whether it's an extension header or the upper- layer protocol).
* Header Checksum (Option D):This field was entirely removed in IPv6. IPv6 relies on the data link layer (Ethernet) and the transport layer (TCP/UDP) to perform error detection, significantly reducing the processing overhead for routers in the core of a service provider network.
質問 # 20
What are three default BGP advertisement rules? (Choose three.)
正解：B、D、E
解説：
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.
質問 # 21
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