JNCIS – Enterprise Routing and Switching (JNCIS-ENT) Practice Exam

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• Which configuration is used for IP6-over-IP4 tunnels?
• Which protocol or feature detects and eliminates Layer 2 loops in a network?
• Which feature of the Junos OS installs routes in multiple routing tables?
• Which two pieces of information are communicated by IS-IS TLVs?
• Which type of routing protocol is BGP best described as?
• What advantage does ISC provide over traditional distance-vector protocols?
• In VRRP, what factor does not contribute to the selection of the master router?
• Which command allows you to display the IP address of all routed VLAN interfaces (RVIs)?
• What are three common characteristics of OSPF and IS-IS?
• Which operational command can verify load balancing?
• What action does the Junos OS take when an EX Series switch receives an Ethernet frame with a destination MAC address not found in the bridging table?
• What does the no-preempt command do in VRRP?
• Why does a router create an ASBRSum (Type 4) LSA?
• Which BGP attributes are listed in the correct route selection order?
• Which two commands can be used to show the content of a bridge table?
• How does OSPF determine the best path through the network?
• What is the correct sequence of OSPF adjacency formation?
• When using RSTP, which condition makes a port enter the Learning state?
• With which type of IS-IS router can an IS-IS Level 2-only router form an adjacency?
• Which command can you use to view the link-state PDUs?
• Which type of port must be an 802.1Q tagged port?
• What is the default IP time-to-live (TTL) value for an EBGP session?
• Which type of OSPF area must not contain any ASBRs and must not receive Extern LSAs?
• Using standard metrics, what is the maximum path cost in IS-IS?
• How does Router-A forward traffic destined to 172.18.3.5 with four equal-cost paths available?
• How does a switch react when it does not recognize a source MAC address in its bridge table?
• To enable nonstop active routing (NSR), which two commands must be used?
• Which Junos operational mode command displays all BGP routes sent to the 172.16.1.1 peer?
• Which three statements are correct about a Junos firewall filter?
• Which BGP attribute is used to influence inbound traffic when two peering sessions to the same AS exist?
• An operator can use the show vlans command with no options to determine which two of the following?
• In which state is an interface placed if root-protect is enabled and a superior BPDU is received?
• Which feature will cause the port to transition into a blocking state when BPDUs are no longer being received?
• Which three configurations are needed for an operational routed VLAN interface (RVI)?
• Which feature disables an edge port when spanning tree communications are received on that port?
• Which BGP attribute can modify only an adjacent AS's optimal entry point into the local AS?
• Which OSPF reference bandwidth setting would give a 1-Gbps link a metric of 10?
• In an OSPF packet capture, a Type 2 LSA indicates that the packet originated from which type of router?
• What type of domain does a VLAN primarily provide separation for?
• Which part of OSPF is responsible for maintaining neighbor relationships?
• In which OSPF state do routers first exchange their link-state information?
• What is the primary reason packets with a large size are not arriving when sent through a GRE tunnel?
• A BGP session has transitioned from connect state to active state. What does this indicate?
• Which routing-instance type allows the sharing of interface routes and the support features used in source-based routing?
• Which BGP configuration option is required when peering with an IBGP neighbor using loopback addresses?
• To route both IPv4 and IPv6 packets in your environment, which configuration is necessary at the [edit protocols] level?
• What does the acronym SRST stand for in networking?
• Which Junos operational command displays all operational IS-IS neighbors?
• Which three statements accurately describe IP source guard?
• Which configuration provides dynamic ARP inspection on access port ge-0/0/0?
• Which configuration provides connectivity from the test routing instance to the 192.168.3.0/24 subnet in inet.0?
• What is one benefit of the root protection feature?
• Which configuration is needed to influence BGP route selection?
• When a switch receives a broadcast frame, how does it handle it?
• What is the default port mode for switch ports on EX Series switches?
• Which virtual interface is used to configure a GRE tunnel?
• Which command is used to verify OSPF neighbor adjacencies on a router?
• What are two valid BPDU types?
• Which statement regarding redundant trunk groups (RTGs) is true?
• Which two statements are true regarding the default VLAN in EX Series switches?
• Which statement describes the default Junos OS behavior for OSPF?
• Which three statements correctly describe the default BGP advertisement behavior in the Junos OS?
• Which two configurations will correctly add ge-0/0/0 and ge-0/0/1 to the VLAN data?
• What is the purpose of OSPF in a network?
• Which two OSPF LSA types can be used to advertise routes between areas?
• Which statement regarding redundant trunk groups (RTGs) is true?
• In a switched network with redundant paths, which frame does not require the implementation of a spanning tree to prevent a loop?
• When using the factory-default configuration, which VLAN is assigned to all interfaces on an EX Series switch?
• When does a root-protected port transition back to the forwarding state?
• Which feature distinguishes a designated router in OSPF?
• Which command configuration is valid for associating a VLAN with an interface on EX Series switches?
• Which three actions can be configured as terminating actions in a firewall filter?
• Which status for VRRP routers is NOT valid?
• Which two statements describe STP and RSTP interoperability?
• What is the main function of a router?
• Which of the following is enabled by default on an EX Series switch?
• On an edge router, you want to create a default route with a next hop to an external connection that is only available when you receive routes from the external provider. What type of route should you configure?
• Which OSPF area type allows external routes to be flooded by ASBRs within its own area?
• What does the OSPF LSA Type 3 summarize?
• Which statement is true about the MAC entries in a switch's bridge table?
• Filter-based forwarding requires a match filter, a routing instance, and which of the following?
• What might cause an IP-IP tunnel to appear established but not transmit traffic?
• What is the default value of the link-state advertisement (LSA) refresh timer in the Junos OS?
• How does a Level 1 IS-IS router reach destinations outside its own area?
• Which communication protocol does IS-IS utilize?
• You want to allow RIP routes to be redistributed by an ASBR into the connected OSPF area. Which OSPF area type would be used to satisfy the requirement?
• Which BGP configuration parameter allows the router to wait for the peer to initiate the open request?
• Which BGP state indicates an active session without a successful peering?
• Which configuration excerpt temporarily shuts down interfaces for five minutes upon exceeding storm control levels?
• To enable inter-VLAN routing between two VLANs on an EX Series switch, which steps are required?
• By default, how frequently does the designated intermediate system (DIS) send out its hello packets?
• What is required for OSPF routers to establish neighbor relationships?
• Which of the following is a correct characteristic of OSPF?
• How much overhead does the GRE header add to an IPv4 packet?
• What is the result of dynamic VLAN tagging on a switch port?
• Which three statements accurately describe IP source guard?
• An ABR is connected to an NSSA, which configuration disables the exporting of Type 7 LSAs into the connected NSSA?
• Which three parameters are used by Junos OS to distinguish traffic flows for load balancing?
• What is the maximum metric for a router using standard metrics with a single link to a Level 2 IS-IS neighbor?
• With which type of IS-IS router can an IS-IS Level 1-only router form an adjacency?
• In which scenario would a totally stubby area be used in OSPF?
• How many untagged VLANs can be configured on an EX Series switch port?
• Which approach can you use to implement IPv6-over-IPv4 tunneling?
• Which statement regarding internal BGP sessions is true?
• What does the attach bit in an IS-IS PDU signify?
• What is a requirement for link aggregation?
• What is the primary purpose of the LLDP-MED?
• What is the main purpose of OSPF area types?
• How does root protection protect your network?
• Which configuration correctly assigns the deny-telnet firewall filter as an input filter to all ports in VLAN 200?
• Which STP protection feature should be used to prevent an inadvertent change in topology caused by the receipt of a superior BPDU on an access interface?
• Which step in the configuration of filter-based forwarding controls the selection of tables that will share interface routes?
• Which configuration example sets per-flow equal-cost multipath (ECMP) load balancing for OSPF routes?
• Which option shows the configuration syntax for a routed VLAN interface on an EX Series switch?
• What is a key mechanism used by OSPF to maintain neighbor relationships?
• What does the default VLAN configuration for an EX Series switch assign to the switch ports?
• Which configuration example accomplishes per-flow load balancing for all routes on Router-1?
• Which two link-state advertisement (LSA) types are allowed in a stub area?
• What is the purpose of using next-hop-self in BGP?
• Which Junos command correctly configures the ge-0/0/0.0 interface to operate only for IS-IS Level 2?
• Which statement about LACP is true?
• How do two BGP peers signal their capabilities to each other?
• Which misconfiguration would cause an OSPF neighbor ship to be stuck in an ExStart state?
• What VLAN ID value is associated by default with the default VLAN on EX Series switches?
• Which command modifies the VLAN membership of a switched port?
• What is the purpose of the OSPF cost metric?
• When two OSPF routers on a broadcast network are ready to exchange database descriptor packets, which router is responsible for setting the initial sequence number?
• In BGP, what do we call the process of determining the best route among multiple options?
• When is MAC limiting performed on a frame from an unknown source MAC address?
• Which two characteristics describe an OSPF link-state update?
• Which side of the OSPF router initiates the database description exchange?
• Which two forms of spanning-tree protection are offered by EX Series switches?
• Which command can be used to verify whether a BGP prefix is being advertised to a specific neighbor?
• A switch port is sending both tagged and untagged traffic. What is its possible configuration?
• In OSPF, what type of router is responsible for summarizing routes?
• Which attribute must be configured within the spanning-tree protocol to ensure a new switch is the root bridge?
• What type of protocol is OSPF?
• Which of the following can be used for both security and loop prevention?
• What is the default TTL value in a VRRP advertisement?
• Which two of the following are functions of the BGP update message?
• In a scenario where a designated bridge has multiple ports connected to a LAN segment, which port is selected as the designated port?
• By default, how is the best IGP path determined when there are multiple equal-cost paths to a destination?
• If you configure a metric of 200 on an IS-IS-enabled interface and see a metric of 67 on another device's routing table, what could explain this behavior?
• Which statement is true about IS-IS PDUs?
• Which two statements are true about Dynamic ARP Inspection?
• Which OSPF LSA type is sent by all routers in an area to advertise its connected subnets?
• Which two new port roles does RSTP introduce?
• Which three statements accurately describe default BGP advertisement rules?
• What is one benefit of a switched LAN?
• Which OSPF LSA type has a domain flooding scope?
• Which command correctly assigns AS 65432 as the local router's autonomous system?
• When processing inbound Ethernet frames, which firewall filter is evaluated first by an EX Series switch?
• Which statement describes IS-IS operation?
• When configuring a redundant trunk group on a switch, which command will ensure that the switch continues using the secondary link after a failover?
• At which configuration hierarchy level is a static bridge table entry configured?
• BGP uses which underlying protocol to establish connection to peers?
• To make several subnets reachable from outside your enterprise network, which type of route should be configured on the edge device?
• Which command is used to verify that graceful Routing Engine switchover (GRES) is operational?
• What does the no-summaries configuration in an OSPF area do?
• What is the default behavior of a trunk port when it receives transit traffic without a VLAN tag?
• Which two scenarios might prevent an IS-IS adjacency from forming?
• When receiving BGP updates from two peers with different AS paths and MED values, how will the router determine which path is preferred?
• Which statement is true regarding the function of redundant trunk groups (RTG)?
• Which configuration allows the virtual IP address to respond to pings?
• Which configuration allows for importing a rib-group?
• How many full adjacencies does R3 have when connected to six routers in the same subnet?
• Which two statements are true about NSR?
• Which protocol is an EGP?
• To verify that an IP-IP tunnel interface is operational, which command should you use?
• Which statements are true about graceful Routing Engines switchover (GRES)?
• Which instance type is used when configuring filter-based forwarding?
• Configuring bpdu-timeout-action enables which protection mechanism?
• How often will the routing table be synchronized between two routers using EBGP over a single T1 link?
• What configuration is required for the default VLAN on EX Series switches?
• Which command do you use to check the VLAN membership of an interface on a switch?
• You have connected a spanning-tree-enabled device to your spanning-tree-enabled switch, but the switch port does not forward traffic, even after you remove the device. Which command do you use to re-enable forwarding?
• Which type of protocol is OSPF?
• You configured an aggregate route of 192.168.8.0/21 and don't see it in the operational output. What could explain this?
• What type of routing does BGP use?
• Which OSPF metric would result from a bandwidth reference of 10,000,000,000 on a 1-Gbps link?
• What does the term 'route reflector' mean in BGP?
• What statement describes the operation of a stub area?
• What type of routing protocol is IS-IS classified as?
• Which three types of firewall filters are supported by Juniper Networks EX Series Ethernet switches?
• Which command allows RSTP interface ge-0/0/9 to transition states immediately when a host is plugged in?
• Which configuration summarizes external routes in the 172.16.0.0/22 range into a single prefix on an ABR for Area 1?
• What is the default interval for a VRRP advertisement?
• What command allows configuration of the duplex setting on multiple interfaces of an EX Series switch simultaneously?
• Which statement regarding the benefits of using GRE instead of IP-IP tunneling is true?
• What command would you use to display the interface status and statistics on a JUNOS device?
• An OSPF broadcast segment has four OSPF-speaking routers. How many 2Way OSPF sessions does a router in the DR other state have?
• While viewing the Ethernet switching table, what could lead to a previous entry being removed?
• Which configuration correctly sets interface ge-0/0/4 in trunk mode, carrying VLANs v10 and v20?
• Under which hierarchy do you configure BGP neighbors?
• What is a benefit of the 802.3ad standard?
• Which statement is true of BGP communities?
• What feature in Junos can be used to prevent certain network addresses from being included in the routing table?
• Given that ge-0/1/1 is set up as a trunk port, which command set will NOT successfully set the trunk to carry VLANs 10 and 11?
• Which statement about BGP routes is accurate?
• Which three statements are correct about the processing order of firewall filters on a Junos device?
• What is preserved by enabling graceful Routing Engine switchover (GRES)?
• How can you configure a port to support both tagged and untagged traffic for a VLAN?
• Which protocol utilizes a Designated Router on broadcast networks?
• What is one of the main functions of STP in a Layer 2 network?
• Which of the following is true of external LSAs in the Junos OS?
• In the Junos OS, which attribute is used before the AS path in the BGP selection algorithm?
• What describes the action of the qualified-next-hop parameter in a configuration?
• In an NSSA with two ABRs, what translates Type 7 LSAs to Type 5 LSAs?
• Which configuration excerpt is necessary to route all traffic received on fe-0/0/0.0 to the next-hop 10.1.1.1?
• Which routing protocols allow for address summarization between areas?
• What causes an increase in dropped packets for a GRE tunnel when the DF bit is set?
• Which protocol operates primarily on Layer 3 of the OSI model?
• What can cause a route learned through IBGP to be marked as hidden?
• What are three common characteristics of OSPF and IS-IS?
• To ensure that interface routes appear in multiple routing instances, what should be configured?
• Which command will help you determine the origin of a route learned through OSPF in your routing table?
• What does the minimum-interval configuration for BFD indicate?
• What is the next step in BGP path selection after verifying the next-hop address can be reached?
• Which two statements about GRE tunnels are true?
• Two routers functioning as DR other on a broadcast link will establish which kind of OSPF neighbor state with each other?
• What is the default state of RSTP ports on a switch?
• An administrator finds that traffic from a large file download over an HTTP session is not load-balanced across multiple links in a LAG. What is the possible cause?
• Which configuration command would be used to add an IPv6 static route to a Junos device?
• In which area type did an OSPF Type 7 LSA originate?
• When loop protection is enabled on an interface, what happens when the port stops receiving BPDUs?
• During OSPF neighbor adjacency formation, in which state is the initial database descriptor sequence number chosen?
• Which statement is true about IS-IS hello (IIH) PDUs?
• What is the default administrative distance for OSPF?
• What is the purpose of configuring root protection?
• A network with five switches has been configured to run Rapid Spanning Tree Protocol (RSTP). How many seconds does it take to detect a failure between two neighboring switches?
• Which three configuration settings under the STP hierarchy allow STP to behave similarly to RSTP?
• In a network where Switch-1 runs STP and Switch-2 runs RSTP, what is true?
• When using IS-IS, to which multicast address will the peers send their hello packets?
• Under what condition does OSPF perform route summarization?
• What is the default OSPF designated router (DR) priority?
• Which statement best describes a routing instance on a Junos device?
• Under which hierarchy do you configure OSPF?
• Which two statements are true regarding a designated intermediate system (DIS) in an IS-IS network?
• On which VLAN interface would an IP address typically be configured for a routed VLAN interface?
• Which OSPF area type can contain Type 7 LSAs?
• In RSTP configuration, which port is disabled when receiving BPDUs?
• What mechanism does OSPF use to establish neighbor relationships?
• What event prompts an update to the forwarding table information for a route with multiple physical next hops?
• Which mechanism prevents a switch from forwarding Layer 2 traffic from one broadcast domain to another?
• What is the proper ingress processing sequence for firewall filters on an EX Series switch?
• Which feature is used to route traffic to a specified ISP based on the source address?
• When the command show ospf neighbor shows one neighbor in the exStart state, what is the most likely cause?
• Which of the following is a spanning tree option in EX Series switches?
• To ensure internal routers have reachability to networks learned from external peers, which configuration excerpt is correct?
• How can you route all traffic arriving on interface fe-0/0/0.0 to next-hop 10.1.1.1, regardless of other routes?
• Under which hierarchy is OSPF configured?
• What feature can secure a switch interface against a rogue switch running STP?
• In a Virtual Chassis configuration, which three criteria determine which switch becomes the master after reboot?
• What happens to all frames received through a switch port when there are no learned unicast entries in the bridge table?
• What OSPF packet type does Router A send to Router B when it receives an LSA header not in its database?
• What happens when a Junos firewall filter permits the initial connection?
• Which Junos OS operational mode command provides a high-level view of all configured BGP peers?
• What determines which switch will become the designated bridge on the same LAN segment?
• You have enabled VRRP. Which two actions must you perform to prevent preemptive behavior?
• Which protocol is considered an Interior Gateway Protocol (IGP)?