Which two statements are true about a unified ISSU? (Choose two.)
Answer : B,D
Explanation:
B: Recent development work by many router vendors has focused on an effort to provide hitless control plane switchovers, which means keeping the control plane states in sync between the active and standby control planes prior to a switchover. Many consider this capability to be a prerequisite to delivering ISSU. Hitless control planeswitchovers are usually implemented using the same version of code on both active and standby control plane components. However, ISSU design additionally requires different software versions running on active and standby control plane components.
D: Unified ISSU is supported only on dual Routing Engine platforms. In addition, the graceful Routing Engine switchover (GRES) and nonstop active routing (NSR) must be enabled.
References:
https://www.juniper.net/documentation/en_US/junos15.1/topics/reference/requirements/iss u-system-requirements.html https://www.juniper.net/kr/kr/local/pdf/whitepapers/2000280-en.pdf
Which state indicates that the BGP session is fully converged?
Answer : C
Explanation:
In order to make decisions in its operations with peers, a BGP peer uses a simple finite state machine (FSM) that consists of six states: Idle; Connect; Active; OpenSent;
OpenConfirm; and Established.
In the Established state, the peers send Update messages to exchange information about each route being advertised to the BGP peer.
Answer : B
Explanation:
Configuring Routing Between VLANs on One Switch
To segment traffic on a LAN into separate broadcast domains, you create separate virtual
LANs (VLANs).
Of course, you also want to allow these employees to communicate with people and resources in other VLANs. To forward packets between VLANs you normally you need a router that connects the VLANs. However, you can accomplish this on a Juniper Networks switch without using a router by configuring an integrated routing and bridging (IRB) interface (also known as a routed VLAN interfaceor RVIin versions of Junos OS that do not support Enhanced Layer 2 Software).
References: http://www.juniper.net/documentation/en_US/junos15.1/topics/example/RVIs- qfx-series-example1.html
Answer : C
Explanation:
Level 1 adjacencies can be formed between routers that share a common area number.
We need to change ISOaddresses so that both routers have the same area number. If we change the ISO address on R2 49.0002.0010.0042.0002.00, both routers will have 0002 as area number.
Note: Level 2 adjacency can be formed between routers that might or might not share an areanumber.
References: http://www.juniper.net/techpubs/en_US/junos16.1/topics/example/isis-multi- level.html
An EBGP session sources its TCP connection from which IP address?
Answer : D
Explanation:
The BGP session between two BGP peers is said to be an external BGP (eBGP) session if the BGP peers are in different autonomous systems (AS) . A BGP session between two
BGP peers is said to be an internal BGP (iBGP) session if the BGP peers are in the same autonomous systems.
By default, the peer relationship is established using the IP address of the interface closest to the peer router.
References:http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol- bgp/13751-23.html
Which two prefixes are martian routes by default? (Choose two.)
Answer : B,D
Explanation:
Martian addresses are host or network addresses about which all routing information is ignored. When received by the routing device, these routes are ignored. They commonly are sent by improperly configured systems on the network and have destination addresses that are obviously invalid.
To view the default and configured martian routes, run the show route martians command.
IPv4 Martian Addresses -
[email protected]> show route martians table inet.
inet.0:
0.0.0.0/0 exact -- allowed
0.0.0.0/8 orlonger -- disallowed
127.0.0.0/8 orlonger -- disallowed
192.0.0.0/24 orlonger -- disallowed
240.0.0.0/4 orlonger -- disallowed
224.0.0.0/4 exact -- disallowed
224.0.0.0/24 exact -- disallowed
inet.1:
0.0.0.0/0 exact -- allowed
0.0.0.0/8 orlonger -- disallowed
127.0.0.0/8 orlonger -- disallowed
192.0.0.0/24 orlonger -- disallowed
240.0.0.0/4 orlonger -- disallowed
Etc.
References:https://www.juniper.net/documentation/en_US/junos16.1/topics/concept/martia n-addresses-understanding.html
What are two interarea OSPF LSA types? (Choose two.)
Answer : A,B
Explanation:
A: The fourth LSA type, network example:
Depending on the link type, OSPF sends link state update packets to which two addresses? (Choose two.)
Answer : B,D
Explanation:
Every time a router sends an update, it sends it to the DR and BDR on the multicast address 224.0.0.6. The DR will then send the update out to all other routers in the area, to the multicast address 224.0.0.5.
References:https://en.wikipedia.org/wiki/Open_Shortest_Path_First
What information is included in the DHCP snooping database? (Choose two.)
Answer : A,D
Explanation:
When DHCP snooping is enabled, the lease information from the server is used tocreate the DHCP snooping table, also known as the binding table. The table shows current IP-
MAC bindings, as well as lease time, type of binding, names of associated VLANs, and associated interface.
References:http://www.juniper.net/techpubs/en_US/junos13.2/topics/concept/port-security- dhcp-snooping-els.html
Which protocol prevents loops and calculates the best path through a switched network that contains redundant paths?
Answer : B
Explanation:
Spanning Tree Protocol (STP) is a Layer 2protocol that runs on bridges and switches. The main purpose of STP is to ensure that you do not create loops when you have redundant paths in your network
Which two statements are true about DIS elections in IS-IS? (Choose two.)
Answer : B,D
Explanation:
In IS-IS, deterministic DIS election makes the possibility of predicting the router that will be elected as DIS from the same set of routers. The router advertising the numerically highest priority wins, with numerically highest MAC address, also called a Subnetwork Point of
Attachment (SNPA), breaking the tie.
References:https://kb.juniper.net/kb/documents/public/junos/StudyGuides/Ch4_from_JNCI
P_studyguide.pdf -
Which two statements are correct about aggregate routes in the Junos OS? (Choose two.)
Answer : A,B
Explanation:
A route can contribute only to a single aggregate route.
You can configure only one aggregate route for each destination prefix.
You notice that there are currently two MAC addresses associated with a single access port in the bridge table on one of your EX Series switches.
What are two explanations for this behavior? (Choose two.)
Answer : B,D
Explanation:
MAC move limiting detects MAC movement and MAC spoofing on access interfaces. You enable this feature on VLANs.
Answer : C
Explanation:
From the exhibit we see:
109.0.0.0/8 *[Aggegate/130]
Answer : C
Explanation:
From the exhibit se see: Contributing Routes
Note: Route aggregation allows you to combine groups of routes with common addresses into a single entry in the routing table. This decreases the size of the routing table as well as the number of route advertisements sent by the routing device.
An aggregate route becomes active when it has one or more contributing routes. A contributing route is an active route that isa more specific match for the aggregate destination.
References: http://www.juniper.net/techpubs/en_US/junos15.1x49- d40/topics/concept/policy-aggregate-routes.html