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| Section | Objectives |
|---|---|
| BGP | - Configuration, monitoring and troubleshooting - BGP concepts, attributes, path selection - IBGP, EBGP, route policies |
| Tunnels | - Configuration, monitoring and troubleshooting - IP-IP, GRE, IPsec tunnels |
| Layer 2 Security | - Configuration, monitoring and troubleshooting - Port security, storm control, MAC limiting - Dynamic ARP inspection, DHCP snooping - Layer 2 firewall filters |
| High Availability | - Configuration, monitoring and troubleshooting - Graceful restart, nonstop active routing - Virtual Chassis, redundant routing engines |
| Spanning Tree Protocol | - Root bridge, port roles and states - Configuration, monitoring and troubleshooting - STP, RSTP, MSTP concepts and operation |
| IS-IS | - Configuration, monitoring and troubleshooting - IS-IS concepts, levels, routing information |
| OSPF | - Configuration, monitoring and troubleshooting - OSPFv2/v3 concepts, areas, LSA types - Neighbor relationships, route calculation |
| Layer 2 Switching and VLANs | - Configuration, monitoring and troubleshooting - Inter-VLAN routing - VLAN concepts, tagging, ports, native VLAN - Layer 2 switching concepts and operation |
| Protocol Independent Routing | - Static routes, aggregate routes - Configuration, monitoring and troubleshooting - Routing tables, routing preferences - Routing policy and firewall filters |
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NEW QUESTION # 117
Referring to the exhibit, which three statements are correct? (Choose three.)
Answer: A,C,D
Explanation:
According to the Juniper documentation 1 , the output of the show vlans command displays the forwarding options for the VLAN, including the DHCP security features. In the exhibit, the output shows that DHCP security is enabled, and that ARP inspection and IP source guard are also enabled. These features work together to protect the switch from IP spoofing and ARP spoofing attacks. DHCP snooping builds a database of IP/MAC bindings by snooping DHCP messages. ARP inspection validates ARP packets against the DHCP snooping database and drops invalid packets. IP source guard checks the IP and MAC source addresses of packets against the DHCP snooping database and drops spoofed packets 2 3 . Therefore, the correct answer is A, B, and C.
The other options are not correct because:
* D. The DHCP snooping database is not protected by default. To protect the database from corruption or loss, you need to configure a file name and a location for storing the database, and enable periodic write operations to the file 4 . The exhibit does not show any such configuration.
* E. DHCP snooping is not enabled for IPv6 traffic by default. To enable DHCPv6 snooping, you need to configure a DHCPv6 relay agent and specify the trusted interfaces for DHCPv6 messages 5 . The exhibit does not show any such configuration.
References: show vlans | Junos OS , Understanding and Using DHCP Snooping | Junos OS , Understanding and Using Dynamic ARP Inspection (DAI) | Junos OS , Protecting the DHCP Snooping Database | Junos OS
, Understanding and Using DHCPv6 Snooping | Junos OS
NEW QUESTION # 118
Referring to the exhibit, all users connected to the same VLAN can communicate with each other, but not with users on other VLANs in this network.
What must be configured to enable communication between the VLANs?
Answer: D
NEW QUESTION # 119
In a LAN segment, which tie-breaker would spanning tree consider if equal-cost paths exist between two or more switches to the root bridge?
Answer: D
NEW QUESTION # 120
What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?
Answer: D
Explanation:
Explanation
The maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation is 1476 bytes1. This is because GRE packets are formed by the addition of the original packets and the required GRE headers1. These headers are 24-bytes in length and since these headers are added to the original frame, depending on the original size of the packet we may run into IP MTU problems1. The most common IP MTU is 1500-bytes in length (Ethernet)1. When the tunnel is created, it deducts the 24-bytes it needs to encapsulate the passenger protocols and that is the IP MTU it will use1. For example, if we are forming a tunnel over FastEthernet (IP MTU 1500)the IOS calculates the IP MTU on the tunnel as: 1500-bytes from Ethernet -
24-bytes for the GRE encapsulation = 1476-Bytes1.
NEW QUESTION # 121
What is the default keepalive time for BGP?
Answer: B
Explanation:
The default hold-time is 90 seconds, meaning that the default frequency for keepalive messages is 30 seconds.
https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/ref/statement/precision- timers-edit-protocols- bgp.html#:~:text=BGP%20on%20the%20local%20routing,keepalive%20messages%20is%2030
%20seconds
NEW QUESTION # 122
......
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