CCNA DC FAQ: IPv4 Routing Concepts

CCNA Data Center FAQ: IPv4 Routing Concepts



Figure: Host Routing Logic Summary

Q1. A user on a PC opens a command prompt and uses the ipconfig command to see that the PC’s IP address and mask are 192.168.4.77 and 255.255.255.224, respectively. The user then runs a test using the ping 192.168.4.117 command. Which of the following answers is the most likely to happen?
a. The PC sends packets directly to the host with address 192.168.4.117.
b. The PC sends packets to its default gateway.
c. The PC sends a DNS query for 192.168.4.117.
d. The PC sends an ARP looking for the MAC address of the DHCP server.

Answer: B. The PC will send packets to its default gateway when the device it is trying to communicate with is on a different network.

Q2. Router R1 lists a route in its routing table. Which of the following answers list a fact from a route, that the router then compares to the packet’s destination address? (Choose two answers.)
a. Mask
b. Next-hop router
c. Subnet ID
d. Outgoing interface

Answer: A and C. The router will compare the subnet via the mask and subnet ID to determine which route is in the table it matches.

Q3. Which implementation on a Cisco Nexus switch turns off all Layer 2 protocol functions on an interface?
a. Routed interface
b. Switched virtual interface (SVI)
c. Switchport access interface
d. Switchport trunk interface

Answer: A. To disable Layer 2 protocols on an individual interface you must use a routed interface on a Cisco Nexus switch.

Q4. Which interface is preferred if you want to support both Layer 2 and Layer 3 for a VLAN on a Cisco Nexus switch?
a. Trunk
b. Access
c. Switched virtual interface (SVI)
d. Switchport

Answer: C. If you want to have Layer 2 and Layer 3 functionality simultaneously on a Cisco Nexus switch you would use a switched virtual interface (SVI).

Q5. Which interface implementation on a Cisco Nexus switch allows for the faster interface or link down detection when router peering?
a. Switched virtual interface (SVI)
b. Routed interface
c. Trunk
d. ISL

Answer: B. When dealing with link down detection for Layer 3 peering a routed interface is faster than an SVI because an SVI is a logical interface.

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James Palmer

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