jncis-ent exam questions and
answers101
QUESTION: 1
You must modify the default RSTP port behavior on interface ge-0/0/9 so it can
transition states immediately when a host is plugged in. It is on a half-duplex link.
Which command meets this requirement?
A. set protocols rstp interface ge-0/0/9.0 mode edge
B. set protocols rstp interface ge-0/0/9.0 mode portfast
C. set protocols rstp interface ge-0/0/9.0 mode point-to-point
D. set protocols rstp interface ge-0/0/9.0 mode shared - ANSWERS-c
Which statement describes how root protection protects your network?
JN0-343
88 http://www.certmagic.com
A. It dynamically modifies the STP bridge priority to the best value in your
network.
B. It ignores superior BPDUs from being accepted on a protected interface.
C. It changes protected ports to the blocking state if they receive superior BPDUs.
D. It is enabled on a switch and uses BPDUs to negotiate a better bridge priority
than its neighbors. - ANSWERS-c
You need additional security and are configuring IP source guard. Which three
statements accurately describe IP source guard? (Choose three.)
A. The default setting for access ports using IP source guard is untrusted.
,B. IP source guard does not check packets received on a trunk interface.
C. You can enable IP source guard on interfaces and VLANs.
D. Packets with an invalid IP address or MAC address are rejected.
E. IP source guard checks the IP/MAC address of packets received against entries
stored in the DHCP snooping database. - ANSWERS-a,b,e
What are three common characteristics of OSPF and IS-IS? (Choose three.)
A. Both routing protocols maintain a link-state database calculated using the
Dijkstra shortest path first algorithm.
B. Both routing protocols elect a designated router and backup designated router for
a shared LAN segment.
C. Both routing protocols use hello packets to form and maintain adjacencies.
D. Both routing protocols use a SHA-1 hash for authentication purposes.
E. Both routing protocols allow for address summarization between areas. - ANSWERS-a,c,e
How much overhead does the GRE header add to an IPv4 packet?
A. 24 bytes
B. 32 bytes
C. 48 bytes
D. 64 bytes - ANSWERS-Answer: A
Which OSPF area type can contain Type 7 LSAs?
A. backbone
B. not-so-stubby
C. stub
D. totally stubby - ANSWERS-Answer: B
,Which two pieces of information are communicated by IS-IS TLVs? (Choose two.)
A. network protocols supported
B. designated router priority
C. authentication key
D. PDU Length - ANSWERS-Answer: A, C
Which two of the following are functions of the BGP update message? (Choose
two.)
A. It withdraws routes that are no longer valid.
B. It notes that an unsupported option is detected from the open message.
C. It transports routing information between BGP peers.
D. It readvertises routes that have already been sent and acknowledged. - ANSWERS-Answer: A,
C
Which routing-instance type allows the sharing of interface routes and the support
features used in source-based routing?
A. virtual-router
B. vrf
C. forwarding
D. multi-instance - ANSWERS-Answer: C
Which statement describes the default Junos OS behavior for OSPF?
A. External LSAs are advertised in a stub area.
B. An ABR does not announce a default route into a stub area.
, C. Stub area internal routers generate a default route.
D. Only totally stubby areas need a default route. - ANSWERS-Answer: B
What are two valid BPDU types? (Choose two.)
A. topology change notification
B. configuration change
C. configuration
D. root bridge - ANSWERS-Answer: A, C
QUESTION: 12
Which of the following is enabled by default on an EX Series switch?
A. MAC move limiting
B. storm control
C. IP source guard
D. dynamic ARP inspection - ANSWERS-Answer: B
Which three statements correctly describe the default BGP advertisement behavior
in the Junos OS? (Choose three.)
A. Routes learned through EBGP are advertised to IBGP peers.
B. Routes learned through EBGP are advertised to other EBGP peers.
C. Routes learned through IBGP are advertised to other IBGP peers.
D. Routes learned through IBGP will be advertised to EBGP peers.
E. Routes learned through an IGP are automatically advertised to EBGP peers. - ANSWERS-
Answer: A, B, D
answers101
QUESTION: 1
You must modify the default RSTP port behavior on interface ge-0/0/9 so it can
transition states immediately when a host is plugged in. It is on a half-duplex link.
Which command meets this requirement?
A. set protocols rstp interface ge-0/0/9.0 mode edge
B. set protocols rstp interface ge-0/0/9.0 mode portfast
C. set protocols rstp interface ge-0/0/9.0 mode point-to-point
D. set protocols rstp interface ge-0/0/9.0 mode shared - ANSWERS-c
Which statement describes how root protection protects your network?
JN0-343
88 http://www.certmagic.com
A. It dynamically modifies the STP bridge priority to the best value in your
network.
B. It ignores superior BPDUs from being accepted on a protected interface.
C. It changes protected ports to the blocking state if they receive superior BPDUs.
D. It is enabled on a switch and uses BPDUs to negotiate a better bridge priority
than its neighbors. - ANSWERS-c
You need additional security and are configuring IP source guard. Which three
statements accurately describe IP source guard? (Choose three.)
A. The default setting for access ports using IP source guard is untrusted.
,B. IP source guard does not check packets received on a trunk interface.
C. You can enable IP source guard on interfaces and VLANs.
D. Packets with an invalid IP address or MAC address are rejected.
E. IP source guard checks the IP/MAC address of packets received against entries
stored in the DHCP snooping database. - ANSWERS-a,b,e
What are three common characteristics of OSPF and IS-IS? (Choose three.)
A. Both routing protocols maintain a link-state database calculated using the
Dijkstra shortest path first algorithm.
B. Both routing protocols elect a designated router and backup designated router for
a shared LAN segment.
C. Both routing protocols use hello packets to form and maintain adjacencies.
D. Both routing protocols use a SHA-1 hash for authentication purposes.
E. Both routing protocols allow for address summarization between areas. - ANSWERS-a,c,e
How much overhead does the GRE header add to an IPv4 packet?
A. 24 bytes
B. 32 bytes
C. 48 bytes
D. 64 bytes - ANSWERS-Answer: A
Which OSPF area type can contain Type 7 LSAs?
A. backbone
B. not-so-stubby
C. stub
D. totally stubby - ANSWERS-Answer: B
,Which two pieces of information are communicated by IS-IS TLVs? (Choose two.)
A. network protocols supported
B. designated router priority
C. authentication key
D. PDU Length - ANSWERS-Answer: A, C
Which two of the following are functions of the BGP update message? (Choose
two.)
A. It withdraws routes that are no longer valid.
B. It notes that an unsupported option is detected from the open message.
C. It transports routing information between BGP peers.
D. It readvertises routes that have already been sent and acknowledged. - ANSWERS-Answer: A,
C
Which routing-instance type allows the sharing of interface routes and the support
features used in source-based routing?
A. virtual-router
B. vrf
C. forwarding
D. multi-instance - ANSWERS-Answer: C
Which statement describes the default Junos OS behavior for OSPF?
A. External LSAs are advertised in a stub area.
B. An ABR does not announce a default route into a stub area.
, C. Stub area internal routers generate a default route.
D. Only totally stubby areas need a default route. - ANSWERS-Answer: B
What are two valid BPDU types? (Choose two.)
A. topology change notification
B. configuration change
C. configuration
D. root bridge - ANSWERS-Answer: A, C
QUESTION: 12
Which of the following is enabled by default on an EX Series switch?
A. MAC move limiting
B. storm control
C. IP source guard
D. dynamic ARP inspection - ANSWERS-Answer: B
Which three statements correctly describe the default BGP advertisement behavior
in the Junos OS? (Choose three.)
A. Routes learned through EBGP are advertised to IBGP peers.
B. Routes learned through EBGP are advertised to other EBGP peers.
C. Routes learned through IBGP are advertised to other IBGP peers.
D. Routes learned through IBGP will be advertised to EBGP peers.
E. Routes learned through an IGP are automatically advertised to EBGP peers. - ANSWERS-
Answer: A, B, D
