CCNA Freshers Experienced Level Advanced Most frequently asking Basic Interview Questions Answers
Q1. If OSPF gets stuck in INIT state in NBMA network type what needs to be checked?
Need to check the reachability between to devices and check OSPF configuration whether all parameters are same and check neighbor is forced at both the end then fix the issue.
Q2. What is the limitation in STP why we are moving to RSTP?
STP will prevent loop in the network. But it ill goes through 4 states to prevent a loop.RSTP is an evolution of STP to prevent looping in the network.it ill take 3 states. It is a fast convergence protocol
Q3. If BGP output is showing in idle(pfx), What could be the issue?
Prefixes coming from the neighbor router are exceeded so need to increase the maximum prefix in BGP neighbor.
Q4. What is the limitation in STP and RSTP why we are using EtherChannel?
In STP and RSTP if one port fails we can have redundancy but can’t do load balancing and can’t have efficient bandwidth we can accomplish these things in EtherChannel.
Q5. In BGP prefix list we adding one segment if it is not receiving from a neighbor when soft reconfiguration is not enabled what needs to be done?
Needs to do BGP soft clear, It gets a new update from a neighbor.
Q6. Whether we can run HSRP in juniper router?
No, since it’s a cisco property.
Q7. What is the use of preemption command in HSRP?
HSRP is for gateway redundancy, One will be active another one will be in standby mode. Once active more router fails standby becomes active. Again the active router coming up it will not be an inactive state. In order to make that, we need to enable preemption.
Q8. What is DAD (Duplicate address detection)?
DHCP server is providing IP address to the client in this case after receiving IP from DHCP server host will send the Gratitude ARP message to all clients to find the conflict any reply receiving for G-ARP request host will not use that IP. This is called DAD process.
Q9. STP election process.
lowest cost to reach root bridge
lowest sender bridge id
lowest on bridge id
lowest sender port id
Q10. In router we have configured enable password and enable secret when taking telnet to the router what password need to give to enter into privilege mode.
Enable secret
Q11. When will different VLAN communicate without a router?
Two switches (sw1 and sw2)are connected via access port one end is connected to VLAN 10 of sw1 other end is connected to VLAN 20 of sw2 when host connected to VLAN 10 is sending traffic it will be received by VLAN 20 connected port of sw2.so sw2 checks the mac table received port belongs to vlan20 so it will send traffic to VLAN 20 connected hosts.
Q12. In my LAN we have 100 hosts are connected which is assigned with segment 192.168.1.0/25 if those systems need to access internet service which type of NAT needs to be used.
NAT with PAT
Q13. What is the difference between numbered ACL and named ACL?
Main difference is editing is possible in named ACL by having a sequence number.
Q14. In eigrp two routers having different hello and hold messages is it for neighbourship or not?
Yes, it will form neighbourship hello and hold no need to be same for eigrp.
Q15. Consider we have two routers(R1 and R2) configured with EIGRP one router(R1) connected with network 10.0.0.0/24 and other routers (R2) connected with network 19.168.1.0/24. How router will advertise 10 n/w to R2.
Router 1 advertise 10n/w as 10.0.0.0 n/w as 10.0.0.0/8 since Auto summary is disabled by default in EIGRP so it can’t understand the subnets. Needs to enable No-Auto summary.
Q16. In eigrp two routers are connected directly via a serial cable and configured with address 10.0.0.0/30 if two routers need to form neighbor ship we need to add them n/w 10.0.0.0/30 in eigrp, Those segments already known by both the router why still we are adding those segments?
Eigrp sends hello message once the segment configured under eigrp configuration. If hello messages exchanged only then eigrp will form neighborship and routing update will happen.
Q17. What needs to be done to make VTP CR number zero?
Change the domain name or delete vlan.dat file.
Q18. What will be the impact when you are connecting the old switch in your network?
If old switch having higher CR number but no VLAN in that database it will be synchronized to all vtp clients. In order to avoid that we need to make the CR number
zero while connecting an old switch to existing network.
Q19. What is the by default load balancing method in GLBP?
round robin
Q20. What is the difference between IBGP and EBGP and Ad value?
internal BGP, External BGP
IBGP: Within as we use IBGP AD-200
EBGP: between as we use EBGP AD-20
Q21. Difference between access and trunk link?
Access port is to carry single VLAN traffic
Trunk port is to carry all the VLAN traffic
Q22. Will these two hosts communicate?
10.0.0.9/24
10.0.0.10/25
yes since network address is same for both the hosts when it was doing ANDING process
Q23. In ACL if it is not matching with any defined statements what action router will take?
Deny
Q24. What are the parameters should be same to form EtherChannel?
Duplex, Speed, VLAN membership, native VLAN, allowed VLAN, trunking encapsulation protocol
Q25. What is the difference between Dot.1q and ISL?
Cisco proprietary, ISL supports a maximum of 1000 VLANs on a trunk port
Open std,802.1Q supports a maximum of 4096 VLANs on a trunk port.
Q26. Bridge ID consists of
bridge priority and Base ethernet
Q27. If all the routers are in area 5. Can hosts communicate with each other?
yes since we have only one area and also the same area
Q28. What is the default entries in a routing table
No entry
Q29. There are 2 entries in the routing table 10.0.0.0/24 via gi0/1
10.0.0.0/22 via gi0/2
if a packet with destination IP 10.0.0.1 is reaching the router what action router will do
send via gi0/2 since best match
Q30. What is the TCP port number of BGP?
179
Q1. If OSPF gets stuck in INIT state in NBMA network type what needs to be checked?
Need to check the reachability between to devices and check OSPF configuration whether all parameters are same and check neighbor is forced at both the end then fix the issue.
Q2. What is the limitation in STP why we are moving to RSTP?
STP will prevent loop in the network. But it ill goes through 4 states to prevent a loop.RSTP is an evolution of STP to prevent looping in the network.it ill take 3 states. It is a fast convergence protocol
Q3. If BGP output is showing in idle(pfx), What could be the issue?
Prefixes coming from the neighbor router are exceeded so need to increase the maximum prefix in BGP neighbor.
Q4. What is the limitation in STP and RSTP why we are using EtherChannel?
In STP and RSTP if one port fails we can have redundancy but can’t do load balancing and can’t have efficient bandwidth we can accomplish these things in EtherChannel.
Q5. In BGP prefix list we adding one segment if it is not receiving from a neighbor when soft reconfiguration is not enabled what needs to be done?
Needs to do BGP soft clear, It gets a new update from a neighbor.
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| CCNA Freshers Basic Interview Questions Answers |
Q6. Whether we can run HSRP in juniper router?
No, since it’s a cisco property.
Q7. What is the use of preemption command in HSRP?
HSRP is for gateway redundancy, One will be active another one will be in standby mode. Once active more router fails standby becomes active. Again the active router coming up it will not be an inactive state. In order to make that, we need to enable preemption.
Q8. What is DAD (Duplicate address detection)?
DHCP server is providing IP address to the client in this case after receiving IP from DHCP server host will send the Gratitude ARP message to all clients to find the conflict any reply receiving for G-ARP request host will not use that IP. This is called DAD process.
Q9. STP election process.
lowest cost to reach root bridge
lowest sender bridge id
lowest on bridge id
lowest sender port id
Q10. In router we have configured enable password and enable secret when taking telnet to the router what password need to give to enter into privilege mode.
Enable secret
Q11. When will different VLAN communicate without a router?
Two switches (sw1 and sw2)are connected via access port one end is connected to VLAN 10 of sw1 other end is connected to VLAN 20 of sw2 when host connected to VLAN 10 is sending traffic it will be received by VLAN 20 connected port of sw2.so sw2 checks the mac table received port belongs to vlan20 so it will send traffic to VLAN 20 connected hosts.
Q12. In my LAN we have 100 hosts are connected which is assigned with segment 192.168.1.0/25 if those systems need to access internet service which type of NAT needs to be used.
NAT with PAT
Q13. What is the difference between numbered ACL and named ACL?
Main difference is editing is possible in named ACL by having a sequence number.
Q14. In eigrp two routers having different hello and hold messages is it for neighbourship or not?
Yes, it will form neighbourship hello and hold no need to be same for eigrp.
Q15. Consider we have two routers(R1 and R2) configured with EIGRP one router(R1) connected with network 10.0.0.0/24 and other routers (R2) connected with network 19.168.1.0/24. How router will advertise 10 n/w to R2.
Router 1 advertise 10n/w as 10.0.0.0 n/w as 10.0.0.0/8 since Auto summary is disabled by default in EIGRP so it can’t understand the subnets. Needs to enable No-Auto summary.
Q16. In eigrp two routers are connected directly via a serial cable and configured with address 10.0.0.0/30 if two routers need to form neighbor ship we need to add them n/w 10.0.0.0/30 in eigrp, Those segments already known by both the router why still we are adding those segments?
Eigrp sends hello message once the segment configured under eigrp configuration. If hello messages exchanged only then eigrp will form neighborship and routing update will happen.
Q17. What needs to be done to make VTP CR number zero?
Change the domain name or delete vlan.dat file.
Q18. What will be the impact when you are connecting the old switch in your network?
If old switch having higher CR number but no VLAN in that database it will be synchronized to all vtp clients. In order to avoid that we need to make the CR number
zero while connecting an old switch to existing network.
Q19. What is the by default load balancing method in GLBP?
round robin
Q20. What is the difference between IBGP and EBGP and Ad value?
internal BGP, External BGP
IBGP: Within as we use IBGP AD-200
EBGP: between as we use EBGP AD-20
Q21. Difference between access and trunk link?
Access port is to carry single VLAN traffic
Trunk port is to carry all the VLAN traffic
Q22. Will these two hosts communicate?
10.0.0.9/24
10.0.0.10/25
yes since network address is same for both the hosts when it was doing ANDING process
Q23. In ACL if it is not matching with any defined statements what action router will take?
Deny
Q24. What are the parameters should be same to form EtherChannel?
Duplex, Speed, VLAN membership, native VLAN, allowed VLAN, trunking encapsulation protocol
Q25. What is the difference between Dot.1q and ISL?
Cisco proprietary, ISL supports a maximum of 1000 VLANs on a trunk port
Open std,802.1Q supports a maximum of 4096 VLANs on a trunk port.
Q26. Bridge ID consists of
bridge priority and Base ethernet
Q27. If all the routers are in area 5. Can hosts communicate with each other?
yes since we have only one area and also the same area
Q28. What is the default entries in a routing table
No entry
Q29. There are 2 entries in the routing table 10.0.0.0/24 via gi0/1
10.0.0.0/22 via gi0/2
if a packet with destination IP 10.0.0.1 is reaching the router what action router will do
send via gi0/2 since best match
Q30. What is the TCP port number of BGP?
179
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