2025年最新の有効なJN0-649リアル試験問題（更新された）100%問題集と練習試験合格させます
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質問 # 97
You have PIM SM multicast configure and running in a network environment comprised of EX4300 devices. Your customer report increased delay when switching channels using IPTV. To help decrease the delay, you implement PIM join balancing. You add the set protocol pim join- load-balance command to the configuration. After committing, you notice that the flows are still using one path.
In this scenario, which statement is correct?
- A. IGMP snooping must be configured.
- B. PIM join load-balancing also be configured.
- C. The interface must be specified to use for load balancing
- D. The clear pim join-distribution command must be issued.
正解：D
質問 # 98
Referring to the exhibit, which statement is correct when a failure exists on the link between host2 and switch5 on this EVPN-VXLAN fabric?
- A. The switch5 device will send a Type 4 route to all peers.
- B. The switch5 device will send a Type 2 route to all peers.
- C. The switch5 device will send a Type 1 route to all peers.
- D. The switch5 device will send a Type 3 route to all peers.
正解：C
解説：
Type 1 routes are used for per-ES auto-discovery (A-D) to advertise EVPN multi-homing mode.
Remote ToR leaf devices in the EVPN network use the EVPN Type 1 route type functionality to learn the EVPN Type 2 MAC routes from other leaf devices. In this route type ESI and the Ethernet Tag ID are considered to be part of the prefix in the NLRI. Upon a link failure between ToR leaf and end server VTEP withdraws Ethernet Auto-Discovery routes (Type 1) per ES. The Juniper EVPN multi-homing Ethernet Tag value is set to the VLAN ID for ES auto-discovery/ES route types.
Mass Withdrawal - Used for fast convergence during link failure scenarios between leaf devices to the end server using Type 1 EAD/ES routes.
質問 # 99
You are implementing a single spanning tree instance in your network and want to use the protocol that will give you the best convergence time in the event of a physical network failure of the root bridge. Which spanning tree protocol will satisfy this requirement?
- A. RSTP
- B. STP
- C. MSTP
- D. VSTP
正解：A
解説：
STP and RSTP are limited to a single instance on any physical interface. Use the interface (Spanning Tree) statement to configure interfaces to participate in the STP or RSTP instance.
https://www.juniper.net/documentation/en_US/junos/topics/topic-map/spanning-tree-instances- interfaces.html
質問 # 100
You are asked to configure 802.1X on your access ports to allow only a single device to authenticate.
In this scenario, which configuration would you use?
- A. single supplicant mode
- B. multiple supplicant mode
- C. MAC authentication mode
- D. single-secure supplicant mode
正解：D
解説：
Single supplicant mode authenticates only the first end device that connects to an authenticator port. All other end devices connecting to the authenticator port after the first has connected successfully, whether they are 802.1X-enabled or not, are permitted access to the port without further authentication. If the first authenticated end device logs out, all other end devices are locked out until an end device authenticates. Single-secure supplicant mode authenticates only one end device to connect to an authenticator port. No other end device can connect to the authenticator port until the first logs out.
質問 # 101
Click the Exhibit button.
During an outage, you review the status of the Q-in-Q implementation on VLAN 300.
Referring to the exhibit, what would be the cause of the outage?
- A. There are no active ports.
- B. The C-VLANs are disabled.
- C. The S-VLAN is disabled.
- D. The VLAN range overlaps.
正解：A
質問 # 102
Click the Exhibit button.
There is a functioning OSPFv3 neighborship between Router-1 and Router-2 over the ge-0/0/1 link. However, the 172.100.100.0/24 and 172.101.101.100/24 routes are not being shared through OSPFv3.
Referring to the configuration shown in the exhibit, which two actions must you take to solve the problem? (Choose two.)
- A. Add the lo0 interface under OSPFv3 for both routers.
- B. Add the IPv6 family protocol under ge-0/0/2 for both routers.
- C. Add interface ge-0/0/1 under the IPv4 unicast realm for both routers.
- D. Add interface ge-0/0/2 under OSPFv3 for both routers.
正解：B、C
質問 # 103
You are asked to configure 802.1X on your access ports to allow only a single device to authenticate.
In this scenario, which configuration would you use?
- A. single supplicant mode
- B. multiple supplicant mode
- C. MAC authentication mode
- D. single-secure supplicant mode
正解：D
解説：
Single supplicant mode authenticates only the first end device that connects to an authenticator port. All other end devices connecting to the authenticator port after the first has connected successfully, whether they are
802.1X-enabled or not, are permitted access to the port without further authentication. If the first authenticated end device logs out, all other end devices are locked out until an end device authenticates. Single-secure supplicant mode authenticates only one end device to connect to an authenticator port. No other end device can connect to the authenticator port until the first logs out
質問 # 104
You are deploying IP phones in your enterprise network that must receive their power through their Ethernet connection. You are using your EX Series switch's PoE ports that support IEEE 802.3af.
In this scenario, what is the maximum amount of power allocated to each interface?
- A. 10.2 W
- B. 30 W
- C. 15.4 W
- D. 50 W
正解：C
質問 # 105
Referring to the exhibit, which statement is correct?
- A. The route is learned from three different neighbors.
- B. The route is learned from a multihop BGP session.
- C. The route is learned from only one neighbor.
- D. The route is learned from a multipath BGP session.
正解：C
質問 # 106
You are using 802.1X authentication in your network to secure all ports. You have a printer that does not support 802.1X and you must ensure that traffic is allowed to and from this printer without authentication.
In this scenario, what will satisfy the requirement?
- A. static MAC bypass
- B. MAC filtering
- C. MAC RADIUS
- D. MACsec
正解：A
解説：
https://www.juniper.net/documentation/us/en/software/junos/user-access/topics/topic-map/static-mac-bypass-mac-radius-authentication.html
質問 # 107
Juniper devices use the token bucket algorithm for policing. Which two statements are true regarding the token bucket algorithm? (Choose two.)
- A. Policers reduce the speed of an interface.
- B. Policers enforce gaps between transmitted packets.
- C. Policers transmit streams of traffic at the maximum interface speed until the burst rate is reached.
- D. Policers do not reduce the speed of an interface.
正解：B、D
質問 # 108
You are troubleshooting an EVPN-VXLAN IP fabric and observe the loop shown in the exhibit.
Which two steps would you take to further troubleshoot this problem? (Choose two.)
- A. Issue the show route table bgp.evpn.0 command on Leaf2 and verify that Type 4 routes are present.
- B. Verify that the same ESI is configured on the two links from the source.
- C. Verify that the same ESI is configured on the link from the host and that it matches the source.
- D. Issue the show route table bgp.evpn.0 command on Leaf2 and verify that Type 3 routes are present.
正解：A、D
質問 # 109
Referring to the exhibit, traffic ingresses on interface ge-0/0/3 and egresses on interface ge-0/0/4.
Which queue does traffic with the IP precedence value of 100 use?
- A. assured-forwarding
- B. best-effort
- C. network-control
- D. expedited-forwarding
正解：D
質問 # 110
Referring to the exhibit, which two statements are true regarding Q-in-Q tunneling? (Choose two)
- A. The C-VLAN traffic will be encapsulated with an outer VLAN tag of 10.
- B. The C-VLAN traffic will be encapsulated with an outer VLAN lag of 150
- C. The C-VLAN 150 will be sent as the inner VLAN tag
- D. The C-VLANs 100-200 will be sent as the inner VLAN tag
正解：A、D
質問 # 111
Which two authentication methods are available for OSPF on Juniper devices? (Choose two.)
- A. none
- B. MD5 authentication
- C. Certificate
- D. RSA
正解：A、B
質問 # 112
You want to create an OSPF area that only contains intra-area route information in the form of Type 1 and Type 2 LSAs.
In this scenario, which area is needed to accomplish this task?
- A. stub area
- B. totally stubby area
- C. totally non-to-stubby area
- D. non-to-stubby area
正解：B
解説：
* Step 1: Identify the requirement.
* You need an OSPF area that only contains intra-area route information in the form of Type 1 and Type 2 LSAs.
* Step 2: Analyze the possible OSPF area types.
* Option A: Totally non-to-stubby area.
* Option B: Totally stubby area.
* Option C: Stub area.
* Option D: Non-to-stubby area.
* Step 3: Understand OSPF area types.
* Totally Stubby Area (Option B): Only allows Type 1 and Type 2 LSAs and blocks Type 3, 4, and 5 LSAs. It uses a default route to represent external routes.
* This fits the requirement of containing only intra-area routes.
References:
* Juniper OSPF configuration guide on area types.
* Commands for configuring a totally stubby area:
shell
Copy code
set protocols ospf area <area-id> stub no-summaries
質問 # 113
Referring to the exhibit, which LSA type is used to advertise 192.168.1.0/24 to R5?
- A. Type 4
- B. Type 7
- C. Type 5
- D. Type 3
正解：C
解説：
Area-1 has no external connections. However, Area-1 has static route (172.16.31.0/24) that are not internal OSPF route. You can limit the external route advertisements to the area and advertise the static routes by designating the area an NSSA. In an NSSA, the ASBR (vMX1) generates NSSA external (Type 7) LSAs and floods them into the NSSA, where they are contained.
Type-7 LSAs allow an NSSA to support the presence of ASBR and their corresponding external routing information. The ABR (vMX2) converts Type-7 LSAs into Type-5 External LSAs and leaks them to the other areas, but external routes from other areas are not advertised within the NSSA.
An admin should check this and change it
https://www.packetswitch.co.uk/configuring-junos-ospf-stub-and-nssa-areas/
https://www.juniper.net/documentation/us/en/software/junos/ospf/topics/ref/statement/nssa-edit-protocols-ospf.html
質問 # 114
Your company has expanded into office space across the street. The new office space has a single Ethernet connection connected to an unmanaged switch. You must sort traffic based on the IP address into different VLANs once the traffic arrives on your EX Series switches.
Which mechanism would you use to accomplish this task?
- A. dynamic VLANs
- B. Q-in-Q tunneling
- C. filter-based VLANs
- D. MVRP
正解：C
解説：
https://next-hop-self.com/juniper-filter-based-vlan-assignment.html
https://www.juniper.net/documentation/us/en/software/junos/routing-
policy/topics/example/firewall-filter-ex-series-configuring.html
質問 # 115
What allows non-Web enabled devices to access the network on a port configured for captive portal?
- A. LLDP can be used to query the type of device that is attempting to access the network, and predefined device types can be allowed to bypass the captive portal process.
- B. Authentication credentials for specific devices can be preconfigured on the switch for automatic authentication.
- C. A MAC address white list can be configured on the switch to allow specific MAC addresses to bypass the captive portal process.
- D. Captive portal can be configured to only prompt for credentials when HTTP or HTTPS traffic is requested on a port to allow on-HTTP enabled devices access to the network.
正解：C
質問 # 116
You recently implemented the configurations shown in the exhibit. After committing these changes, the community devices connected to AS-1 are not able to communication with the appropriate community devices connected to AS-2.
What must be to allow these community devices to communicate?
- A. You must configure to allow the ge-0/0/1 interface on AS-1 as the inter-switch.
- B. You must configure the ge-0/0/10 interface on AS-1 as the inter-switch link.
- C. You must configure the ge-0/0/1 interface on both switches the inter-switch links.
- D. You must configure an isolation VLAN ID under the vlan-pri vlan on the AS-2 switch.
- E. You must configure an isolation VLAN ID under the vlan-pri VLAN on both switches.
正解：C
質問 # 117
Referring to the exhibit, which two statements are correct? (Choose two.)
- A. The DS-1 switch will be root bridge for MSTI 1.
- B. The DS-2 switch will be root bridge for MSTI 1.
- C. The DS-1 switch will be root bridge for MSTI 2.
- D. The DS-2 switch will be root bridge for MSTI 2.
正解：A、D
解説：
DS1 - root bridge for msti 1 (vlan 10-19) - due to bridge priority 4k
DS2 - root bridge for msti 2 (vlan 20-29) - due to bridge priority 4k
質問 # 118
You are running OSPF as your IGP. The interfaces connecting two routers are in the ExStart state. You notice that something is incorrect with the configuration. Referring to the exhibit, which statement is correct?
- A. The IP addresses are incorrect.
- B. The subnet mask is incorrect.
- C. The interface type is incorrect.
- D. The MTU setting are incorrect.
正解：A
質問 # 119
You are enabling MSTP in your Layer 2 network to prevent loops. In this scenario, which three parameters must match on all switches in the network? (Choose three. )
- A. configuration name
- B. max age
- C. MSTI-to-VLAN mapping
- D. revision level
- E. bridge priority
正解：A、C、D
質問 # 120
Click the Exhibit button. Referring to the exhibit, how is R5 able to learn the networks that exist within the NSSA?
- A. R5 does not learn those networks but uses a default route advertised by R2 instead.
- B. R5 learns those networks from Type 3 LSAs advertised by R2.
- C. R5 learns those networks from Type 3 LSAs advertised by R3.
- D. R5 does not learn those networks and uses a default route advertised by R3 instead.
正解：C
質問 # 121
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