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| Section | Objectives |
|---|---|
| Spanning Tree Protocol | - Configuration, monitoring and troubleshooting - STP, RSTP, MSTP concepts and operation - Root bridge, port roles and states |
| Protocol Independent Routing | - Configuration, monitoring and troubleshooting - Routing tables, routing preferences - Static routes, aggregate routes - Routing policy and firewall filters |
| Layer 2 Switching and VLANs | - VLAN concepts, tagging, ports, native VLAN - Configuration, monitoring and troubleshooting - Inter-VLAN routing - Layer 2 switching concepts and operation |
| High Availability | - Configuration, monitoring and troubleshooting - Graceful restart, nonstop active routing - Virtual Chassis, redundant routing engines |
| Tunnels | - Configuration, monitoring and troubleshooting - IP-IP, GRE, IPsec tunnels |
| BGP | - Configuration, monitoring and troubleshooting - BGP concepts, attributes, path selection - IBGP, EBGP, route policies |
| Layer 2 Security | - Configuration, monitoring and troubleshooting - Port security, storm control, MAC limiting - Layer 2 firewall filters - Dynamic ARP inspection, DHCP snooping |
| OSPF | - Configuration, monitoring and troubleshooting - OSPFv2/v3 concepts, areas, LSA types - Neighbor relationships, route calculation |
| IS-IS | - Configuration, monitoring and troubleshooting - IS-IS concepts, levels, routing information |
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NEW QUESTION # 93
You are asked to explore deploying IS-IS in your network. What are two considerations in this scenario? (Choose two.)
Answer: B,D
NEW QUESTION # 94
Which statement is correct about the storm control feature?
Answer: B
Explanation:
The storm control feature is enabled in the factory-default configuration on EX Series switches.
On EX2200, EX3200, EX3300, EX4200, and EX6200 switches, the factory default configuration enables storm control for broadcast and unknown unicast traffic on all switch interfaces. On EX4300 switches, the factory default configuration enables storm control on all Layer 2 switch interfaces.
NEW QUESTION # 95
You are concerned about spoofed MAC addresses on your LAN.
Which two Layer 2 security features should you enable to minimize this concern? (Choose two.)
Answer: B,D
Explanation:
* A is correct because dynamic ARP inspection (DAI) is a Layer 2 security feature that prevents ARP spoofing attacks. ARP spoofing is a technique that allows an attacker to send fake ARP messages to associate a spoofed MAC address with a legitimate IP address. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DAI validates ARP packets by checking the source MAC address and IP address against a trusted database, which is usually built by DHCP snooping 1 . DAI discards any ARP packets that do not match the database or have invalid formats 1 .
* C is correct because DHCP snooping is a Layer 2 security feature that prevents DHCP spoofing attacks. DHCP spoofing is a technique that allows an attacker to act as a rogue DHCP server and offer fake IP addresses and other network parameters to unsuspecting clients. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DHCP snooping filters DHCP messages by classifying switch ports as trusted or untrusted. Trusted ports are allowed to send and receive any DHCP messages, while untrusted ports are allowed to send only DHCP requests and receive only valid DHCP replies from trusted ports 2 . DHCP snooping also builds a database of MAC addresses, IP addresses, lease times, and binding types for each client 2 .
NEW QUESTION # 96
Which two statements about BGP facilitate the prevention of routing loops within an autonomous system?
(Choose two.)
Answer: A,B
Explanation:
BGP has a simple loop prevention mechanism for eBGP that checks the AS path for its own AS number.
However, this mechanism does not work for iBGP, since all routers in the same AS have the same AS number. Therefore, iBGP has two additional rules to prevent routing loops within an autonomous system:
A router does not advertise a route learned from an iBGP neighbor to another iBGP neighbor. This rule ensures that a route does not loop back to the original iBGP router through another iBGP path.
A router does not accept a route learned from an iBGP neighbor if the next hop is not reachable via an IGP.
This rule ensures that a router does not forward packets to an unreachable next hop.
These two rules imply that iBGP sessions must be configured as a logical full mesh, meaning that every iBGP router must have a direct iBGP session with every other iBGP router in the same AS. This way, every iBGP router can learn the best route from the eBGP routers and use the IGP to reach the next hop. A logical full mesh does not require a physical full mesh, meaning that iBGP routers do not have to be directly connected.
They can use intermediate routers to establish iBGP sessions, as long as the IGP can reach the next hop.
A logical full mesh can be challenging to scale and maintain, especially for large ASes with many iBGP routers. Therefore, some alternatives to the full mesh requirement have been developed, such as route reflectors and confederations. These alternatives relax the iBGP rules and introduce additional attributes and mechanisms to prevent routing loops, such as originator ID and cluster list. References:
BGP Fundamentals
BGP - eBGP loop prevention mechanism same AS number
Loop Prevention in BGP Routing
NEW QUESTION # 97
Which three protocols support BFD? (Choose three.)
Answer: A,B,E
Explanation:
BFD is a protocol that can be used to quickly detect failures in the forwarding path between two adjacent routers or switches. BFD can be integrated with various routing protocols and link aggregation protocols to provide faster convergence and fault recovery.
According to the Juniper Networks documentation, the following protocols support BFD on Junos OS devices
1 :
* BGP: BFD can be used to monitor the connectivity between BGP peers and trigger a session reset if a failure is detected. BFD can be configured for both internal and external BGP sessions, as well as for IPv4 and IPv6 address families 2 .
* OSPF: BFD can be used to monitor the connectivity between OSPF neighbors and trigger a state change if a failure is detected. BFD can be configured for both OSPFv2 and OSPFv3 protocols, as well as for point-to-point and broadcast network types 3 .
* LACP: BFD can be used to monitor the connectivity between LACP members and trigger a link state change if a failure is detected. BFD can be configured for both active and passive LACP modes, as well as for static and dynamic LAGs 4 .
Other protocols that support BFD on Junos OS devices are:
* IS-IS: BFD can be used to monitor the connectivity between IS-IS neighbors and trigger a state change if a failure is detected. BFD can be configured for both level 1 and level 2 IS-IS adjacencies, as well as for point-to-point and broadcast network types.
* RIP: BFD can be used to monitor the connectivity between RIP neighbors and trigger a route update if a failure is detected. BFD can be configured for both RIP version 1 and version 2 protocols, as well as for IPv4 and IPv6 address families.
* VRRP: BFD can be used to monitor the connectivity between VRRP routers and trigger a priority change if a failure is detected. BFD can be configured for both VRRP version 2 and version 3 protocols, as well as for IPv4 and IPv6 address families.
The protocols that do not support BFD on Junos OS devices are:
* RSTP: RSTP is a spanning tree protocol that provides loop prevention and rapid convergence in layer 2 networks. RSTP does not use BFD to detect link failures, but relies on its own hello mechanism that sends BPDU packets every 2 seconds by default.
* FTP: FTP is an application layer protocol that is used to transfer files between hosts over a TCP connection. FTP does not use BFD to detect connection failures, but relies on TCP's own retransmission and timeout mechanisms.
References:
1 : [Configuring Bidirectional Forwarding Detection] 2 : [Configuring Bidirectional Forwarding Detection for BGP] 3 : [Configuring Bidirectional Forwarding Detection for OSPF] 4 : [Configuring Bidirectional Forwarding Detection for Link Aggregation Control Protocol] : [Configuring Bidirectional Forwarding Detection for IS-IS] : [Configuring Bidirectional Forwarding Detection for RIP] : [Config uring Bidirectional Forwarding Detection for VRRP] : [Understanding Rapid Spanning Tree Protocol] : [Understanding FTP]
NEW QUESTION # 98
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