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Refer to the exhibit Routers R1 and R2 have been configured with their respective LAN interfaces. The two circuits are operational and reachable across WAN. Which command set establishes failover redundancy if the primary circuit goes down?
Answer: D
Because it is not a failover route, but a permanent route (traffic will pass through this route even if the default route is functional)
Source: Adapted from community discussion — Peter_panda
Refer to the exhibit. R1 learns all routes via OSPF. Which command configures a backup static route on R1 to reach the 192.168.20 0/24 network via R3?
Answer: A
I think it's because of the "back-up static route", if everything is learned via OSPF (110), it needs a bigger AD for a back-up one, so 111. This is the way I think, at least.
Source: Adapted from community discussion — Paullll
Refer to the exhibit. R1 has taken the DROTHER role in the OSPF DR/BDR election process. Which configuration must an engineer implement so that R1 is elected as the DR?
Answer: D
We want R1 to be DR here. Considering all 3 routers are set to use default values for OSPF priority (I.e. value 1) and selection has happened on the basis of highest router ID (highest IP address of its interface), R1 is currently selected as DROTHER. To make it DR, it needs to have the highest priority. Hence correct answer is D from the given options. Reason: On LANs, DR and BDR have to be elected. Two rules are used to elect a DR and BDR: router with the highest OSPF priority will become a DR. By default, all routers have a priority of 1. if there is a tie, a router with the highest router ID wins the election. The router with the second highest OSPF priority or router ID will become a BDR. https://study-ccna.com/designated-backup-designated-router/
Source: Adapted from community discussion — RidzV
Which SDN plane forwards user-generated traffic?
Answer: D
Data Plane - also called forwarding plane which forwards user data/traffic from one interface to another are part of the data plane. Also de-encapsulates the original layer 2 header, and re-encapsulates with a new headser destined for the next hop's MAC address. NAT is the part of the Data Plane.
Source: Adapted from community discussion — Danishh
An application in the network is being scaled up from 300 servers to 600. Each server requires 3 network connections to support production, backup, and management traffic. Each connection resides on a different subnet. The router configuration for the production network must be configured first using a subnet in the 10.0.0.0/8 network. Which command must be configured on the interface of the router to accommodate the requirements and limit wasted IP address space?
Answer: B
We need to be able to put 600 hosts 3 different dedicated subnets. So not 300 existing servers in one subnet and 300 new servers in the next subnet, belonging to production only for example. The subnets must be dedicated. /22 is the only solution for each subnet.
Source: Adapted from community discussion — splashy
Refer to the exhibit. Which interface is chosen to forward traffic to the host at 192.168.0.55?
Answer: C
10.0.12.1 is the IP configured on the router interface Gi0/1, whereas the next hop address is 10.0.12.2 and the route to get to subnet 192.168.0.55 is hanging off the neighbouring router. So, to get that 192.168.0.55 subnet, R1 will send traffic out of its Gi01 interface pointing to 10.0.12.2 next hop neighbouring router's interface which will pass it on to the subnet 192.168.0.55 hanging off its LAN interface. The routing table shows you 192.168.0.0/24 via 10.0.12.2 route, which clearly means the next hop address of the neighbouring router and 192.168.0.55 falls in that range of addresses. Hope this clarifies it :)
Source: Adapted from community discussion — Freddy01
Refer to the exhibit. The administrator must configure a floating static default route that points to 2001:db8:1234:2::1 and replaces the current default route only if it fails. Which command must the engineer configure on the CPE?
Answer: A
ND ::/0 [2/0] - means that the default route was automatically configured with the "ipv6 address autoconfig default" command (interface mode), and will always have AD 2. That's why to have a static default floating route we must include AD 3, if the first route fails, the static will assume with the initials "S ::/0 [3/0]". Out of the question but taking advantage, we can also see the initials "NDp [2/0]" which represents a configuration of a directly connected interface, however the command "ipv6 address autoconfig" was used, in this case without default. These are some of the uses of SLAAC and Neighbor Discovery Protocol (NDP) on the router - to configure IPv6 addresses and default route.
Source: Adapted from community discussion — dropspablo
Refer to the exhibit. Router OldR is replacing another router on the network with the intention of having OldR and R2 exchange routes. After the engineer applied the initial OSPF configuration, the routes were still missing on both devices. Which command sequence must be issued before the clear IP ospf process command is entered to enable the neighbor relationship?
Answer: D
Which component of an Ethernet frame is used to notify a host that traffic is coming?
Answer: C
The component of an Ethernet frame that is used to notify a host that traffic is coming is the preamble. The preamble is a sequence of bits that is transmitted at the beginning of an Ethernet frame and is used to alert the receiving host that a frame is about to be transmitted. The preamble consists of a series of alternating 1s and 0s, followed by a start-of-frame delimiter (SFD). The SFD is a unique pattern of bits that indicates the start of the frame and allows the receiving host to synchronize its clock with the sender's clock. The preamble and SFD together make up the preamble field of the Ethernet frame. After the preamble, the Ethernet frame consists of several other fields, including the destination and source MAC addresses, the type field, and the data field. The data field contains the payload of the frame, which can be a variety of different types of data, such as IP packets or application data. The preamble is important because it allows the receiving host to prepare for the arrival of the frame and ensures that the frame is properly received and processed. Without the preamble, the receiving host may not be aware that a frame is being transmitted, which could result in lost or corrupted data.
Source: Adapted from community discussion — Alizadeh
DRAG DROP -
Refer to the exhibit. Drag and drop the prefix lengths from the left onto the corresponding prefixes on the right. Not all prefixes are used. Select and Place:
This is an interactive task on the real exam — a drag-and-drop, hotspot or ordering question. There is nothing to select here, so the answer is shown below for reference.
Answer: See figure below
I would say the last one is .252 The reason for this is: 209.165.202.128 is reachable via 10.10.12.2 and 10.10.12.2 is part of the 10.10.12.2/30, hence 252
Source: Adapted from community discussion — vladals
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