Last updated on Nov 07, 2023
At the enterprise level, the Cisco Certified Network Professional curriculum prepares candidates to plan, implement, verify, and troubleshoot Local Area Networks (LANs) and Wide Area Networks (WANs). Advanced security, voice, wireless, and video solutions can be efficiently collaborated on by CCNP qualified individuals. Cisco Certified Network Professionals could also find work as a network technician, systems engineer, network administrator, or network engineer in enterprise-level networking roles.
In this article, you can go through the set of CCNP interview questions most frequently asked in the interview panel. This will help you crack the interview as the topmost industry experts curate these at HKR training.
Let us have a quick review of the CCNP interview questions.
Ans: The interface metric in a narrow metric is 6 bits long, and the path metric is 10 bits long. The interface metric of a wide metric is 24 bits long, while the path metric is 32 bits long.
An NSAP address is made up of three parts and has a length of 8 to 20 bytes:
Ans: STP is used to prevent switching loops in switching networks, whereas RSTP is nearly identical to STP with the exception that port forwarding timing has been reduced to zero.
Ans: IGRP is a distance-vector routing protocol developed by Cisco. The default hop count in IGRP is 100, and the maximum hop count is 255. IGRP's default metrics are bandwidth and line latency, but it can optionally use reliability, load, and MTU.
Ans: The four general types of BGP attributes are as follows:
Ans: The entire primary network resides in a core network. The entire network cannot function without a core network. The core network is connected to all routers and switches.
Ans: The same IP address is assigned to two or more RPs. A unicast IP routing protocol is used to broadcast the RPs' IP addresses. Each multicast router selects the RP that is nearest to it. When an RP fails, the routers will switch to the next nearest RP after the unicast IP routing protocol converges. The MSDP is used to exchange active multicast source information between RPs.
Ans: An NSAP address is made up of three components, each of which is 8 to 20 bytes long.
EIGRP has an administrative distance of 90.
IGRP has an administrative distance of 100.
OSPF has an administrative distance of 110.
RIP has an administrative distance of 120.
Hence, the EIGRP route is preferred.
Ans: Convert each octal digit into three binary digits, and then convert the binary result to hexadecimal.
001 010 011 100 101 110 111 000
0010 1001 1100 1011 1011 1000
Ans: The feasible distance on the reporting router is the reported distance to a route that is sent to another router. The metric between the receiving and reporting routers is added to the reported distance to get the feasible distance. The successor is the route having the shortest possible distance. Feasible successors are routes having a reported distance less than the feasible distance.
Ans: State, city, and street are the three components of a postal address that can be used to deliver mail. The area code and exchange of a phone number are both essential. Only the state or city and state information can be used to deliver mail to the next post office at the core layer. The area code is used to deliver a phone number at the core layer.
Ans: Along with the network prefixes, classless routing protocols advertise the subnet mask. Classful routing protocols do not. As a reason, all subnets for the primary network number must be the same length for a classful protocol to work. Discontiguous network prefixes are also not supported by the classful protocol.
Ans: The entries in the unicast IP routing table are used to make multicast forwarding decisions. You can use any dynamic interior routing system, static routes, or a combination of the two for multicast; it doesn't matter how the unicast IP routing table was formed.
Ans: 01 00 5E 00 00 00 is the standard Ethernet multicast address. The IP multicast address's first byte is not used. Subtract 128 from the value of the second byte if it is more than 127, resulting in a value of 0. After converting to hex, the third and fourth bytes of the IP address are used as-is. Their hexadecimal values are 40 and 0C. So, for IP multicast address 126.96.36.199, the Ethernet multicast address is 01 00 5E 00 40 0C.
Ans: The multicast Ethernet address is determined by the IP address's low-order 32 bits. The first four bits are always 1 1 1 0, whereas the next five bits could be anything. As a consequence, the IP multicast addresses that correspond to the 01 00 5E 00 40 0C multicast Ethernet address are
1110 0000 0000 0000 0100 0000 1100 = 188.8.131.52
1110 0000 1000 0000 0100 0000 1100 = 184.108.40.206
1110 0001 0000 0000 0100 0000 1100 = 220.127.116.11
Ans: All routes are advertised into all OSPF areas by default. This comprises OSPF inter-area routes and also external routes inserted into OSPF. IS-IS injects a default route into an area instead of advertising inter-area or external routes.
Ans: Only the state or city/state information is required at the core layer of the postal system to make a routing decision. The precise street names and numbers are masked because the core layer does not require them.
The area code is used to determine a routing decision at the telephone system's core layer. The core layer does not require or hide the specific exchange or last four digits of the phone number.
RIP version 1 and IGRP are classful protocols that do not broadcast the subnet mask.
The network diameter of RIP version 2 is restricted to 15 hops. For determining the shortest path, EIGRP, OSPF, and IS-IS use computationally intensive algorithms. For best path selection and loop identification, BGP uses basic approaches, and it can manage the large number of network prefixes required for Internet routing.
On a Cisco router, enabling IGRP is similar to enabling RIP, except that you select IGRP as the protocol and add an autonomous system number.
For example: RouterA(config)#router igrp 10 (10 is the AS number)
Ans: The destination IP address determines how Unicast IP packets are forwarded. The source IP address determines how multicast packets are forwarded. The multicast packet is sent to multicast neighbors if it is received on the interface used to deliver a unicast packet back to the source. The multicast packet is deleted if it is received on an interface that would not be utilized to deliver a unicast IP packet back to the source.
Ans: Unless the letter needs to be returned to its sender, the source address is not used. The access level post office in New York looks at the state, city, and street information to see if it is directly connected to the destination using the destination address. If this is not the case, the letter will be forwarded through a default route to the distribution layer post office. The state, city, and street information are also examined by the distribution layer post office to see if it is directly connected to an access layer post office that services the particular street. If it isn't, a default route is used to route the letter to the core level. The state name is checked at the core level post office, and if it does not equal New York, the letter is delivered to the California core post office. The letter is delivered from the California central post office to the San Diego distribution post office. The letter is delivered to the access post office that handles the destination street by the San Diego distribution post office. Finally, the access level switch routes the letter to its intended recipient.
Ans: The system of airports. Major hub airports such as Denver, Chicago, New York, and Atlanta are found at the core routing level. People and cargo are routed through the primary airports to significant geographic areas.
Regional airports service a localized area and connect with core airports; regional airports are at the distribution layer. Finally, you can take the bus, a taxi, a train, or rent a car to get to your final destination. This is referred to as the access layer.
A stuck in active (SIA) message indicates that EIGRP has not received a response to a query. The query for that route has not received a response from any EIGRP neighbors (or neighbors).
The router clears the neighbor who did not respond to the query when the SIA occurs.
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