Juniper Networks Certified Internet Specialist (JNCIS-ENT) Set 5

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Juniper Networks Certified Internet Specialist (JNCIS-ENT) Set 5

You want to secure an interface on a switch so that a rogue switch running STP can not be plugged into this interface. What accomplishes this objective?

BPDU protection ✘ edge protection ✘ rogue protection ✘ root protection ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

You want your switch to disable an edge port when it receives spanning tree communications on that port. Which feature accomplishes this objective?

RSTP edge port ✘ BPDU protection ✘ root protection ✘ switch protection ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What is one benefit of the root protection feature?

It guards against loops caused by unidirectional link failures. ✘ It ensures downstream switches never become the root bridge. ✘ It disables the port when it detects that a loop has formed over an edge port. ✘ It guards against loops caused by a changed root bridge ID. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

You want to alter the factory-default storm control configuration so that interfaces on which the storm control level is exceeded are temporarily shut down for five minutes. Which configuration excerpt accomplishes this objective?

{master:0}[edit ethernet-switching-options]
user@Switch-1# show
storm-control {
action-shutdown;
interface all;
error-disable {
disable-timeout 5;
}
}

✘

{master:0}[edit ethernet-switching-options]user@Switch-1# show
port-error-disable {
disable-timeout 300;
}
storm-control {
action-shutdown;
interface all;
}

✘

{master:0}[edit ethernet-switching-options]user@Switch-1# show
storm-control {
shutdown-action;
interface all;
error-disable {
disable-interval 5;
}
}

✘

{master:0}[edit ethernet-switching-options]user@Switch-1# show
port-error-disable {
disable-interval 300;
}
storm-control {
shutdown-action;
interface all;
}

✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What is the proper ingress processing sequence for firewall filters on an EX Series switch?

router filter, port filter, VLAN filter ✘ port filter, VLAN filter, router filter ✘ router filter, VLAN filter, port filter ✘ VLAN filter, port filter, router filter ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

You want to configure per-flow equal-cost multipath (ECMP) load balancing for only the OSPF routes on Router-1. Which configuration example accomplishes this?

protocols {
ospf {
export EMCP;
}
}
policy-options {
policy-statement ECMP {
term first {
from protocol ospf;
then {
load-balance per-packet;
}
}
}
}

✘

routing-options {export ECMP;
}
policy-options {
policy-statement ECMP {
term first {
from protocol ospf;
then {
load-balance per-packet;
}
}
}
}

✘

routing-options {forwarding-table {
export ECMP;
}
}
policy-options {
policy-statement ECMP {
term first {
from protocol ospf;
then {
load-balance per-packet;
}
}
}
}

✘

routing-options {forwarding-table {
export ECMP;
}
}
policy-options {
policy-statement ECMP {
term first {
from protocol ospf;
then {
load-balance ECMP;
}
}
}
}

✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

You want to configure per-flow load balancing for all routes on Router-1. Which configuration example accomplishes this?

routing-options {
forwarding-table {
export ECMP;
}
}
policy-options {
policy-statement ECMP {
term first {
then {
load-balance per-packet;
}
}
}
}

✘

routing-options {export ECMP;
}
policy-options {
policy-statement ECMP {
term first {
then {
load-balance per-packet;
}
}
}
}

✘

routing-options {forwarding-table {
export ECMP;
}
}
policy-options {
policy-statement ECMP {
term first {
from protocol ospf;
then {
load-balance per-packet;
}
}
}
}

✘

routing-options {forwarding-table {
export ECMP;
}
}
policy-options {
policy-statement ECMP {
term first {
from protocol ospf;
then {
load-balance ECMP;
}
}
}
}

✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Router-A has an OSPF route to destination 172.18.3.0/24 with four equal-cost paths .How will Router-A forward traffic destined to 172.18.3.5 based on Junos OS's default behavior?

Traffic will be load-balanced on all four available paths. ✘ Traffic will be forwarded over the one path installed in the forwarding table. ✘ Traffic forwarding will be rotated across each of the four paths for 1 minute on each path. ✘ Traffic forwarding behavior depends on the hardware platform. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

You have a route in the inet.0 routing table that has four valid physical next hops assigned to it. Which event prompts an update to the information in the forwarding table for this particular route?

When a new physical next hop is added to the next-hop set. ✘ When any configuration change is committed on the router. ✘ When a packet is forwarded towards the route destination. ✘ When an additional route of the same IP address class is added to inet.0. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

10.

Which configuration excerpt is necessary to cause all traffic received on fe-0/0/0.0 to be routed to next-hop 10.1.1.1?

interfaces {
fe-0/0/0 {
unit 0 {
family inet {
policy-route route-to-10.1.1.1;
address 172.17.1.1/24;
}
}
}
}
policy-options {
policy-statement route-to-10.1.1.1 {
term 1 {
then {
next-hop 10.1.1.1;
}
}
}
}

✘

interfaces {fe-0/0/0 {
unit 0 {
family inet {
filter {
input route-to-10.1.1.1;
}
address 172.17.1.1/24;
}
}
}
}
firewall {
family inet {
filter route-to-10.1.1.1 {
term 1 {
then routing-instance to-10.1.1.1;
}
}

}
}
routing-instances {
to-10.1.1.1 {
instance-type forwarding;
routing-options {
static {
route 0.0.0.0/0 next-hop 10.1.1.1;
}
}
}
}

✘

interfaces {fe-0/0/0 {
unit 0 {
family inet {
filter {
input route-to-10.1.1.1;
}
address 172.17.1.1/24;
}
}
}
}
firewall {
family inet {
filter route-to-10.1.1.1 {
term 1 {
then next-hop 10.1.1.1;
}
}
}
}

✘

interfaces {fe-0/0/0 {
unit 0 {
family inet {
routing-instance to-10.1.1.1;
address 172.17.1.1/24;
}
}
}

}
routing-instances {
to-10.1.1.1 {
instance-type forwarding;
routing-options {
static {
route 0.0.0.0/0 next-hop 10.1.1.1;
}
}
}
}

✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

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Juniper Networks Certified Internet Specialist (JNCIS-ENT) Set 5

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