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Cisco CCNA — IP Connectivity and IP Services flashcards

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CCNA 200-301 v1.1 domains 3 and 4: reading the routing table, longest match and AD, static and floating routes, single-area OSPFv2, FHRP, NAT/PAT, NTP, DHCP relay, DNS, SNMP, syslog, QoS, SSH setup and TFTP/FTP.

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Learn deck · part of Cisco CCNA · written against: Exam 200-301 v1.1 topics. Updated 2026-10-10.

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  1. In show ip route, what is the difference between a route coded C and one coded L?
    C (connected) is the subnet an up interface belongs to, such as 10.1.1.0/24. L (local) is a /32 host route for the interface's own address, such as 10.1.1.1/32, used for traffic addressed to the router itself.
    IP Connectivity › Routing Table and Path Selection
  2. A routing table entry reads O 10.2.0.0/16 [110/20] via 10.0.0.2, 00:12:44, GigabitEthernet0/1. What are the 110 and the 20?
    110 is the administrative distance (the trust in OSPF as a source) and 20 is the metric (the OSPF cost to reach the prefix).

    10.0.0.2 is the next hop and Gi0/1 the exit interface.
    IP Connectivity › Routing Table and Path Selection
  3. A router's table holds 172.16.0.0/16 as a static route and 172.16.1.0/24 learned by OSPF. Which route forwards a packet to 172.16.1.9, and which forwards one to 172.16.2.9?
    172.16.1.9 follows the OSPF /24 and 172.16.2.9 follows the static /16.

    Why: the longest matching prefix always wins; administrative distance only matters when two sources offer the same prefix and length.
    IP Connectivity › Routing Table and Path Selection
  4. In what order does a Cisco router apply prefix length, administrative distance and metric?
    AD then metric decide what enters the table; prefix length decides forwarding. Between sources offering the same prefix, the lowest AD is installed; within one protocol, the lowest metric. Each packet then uses the longest matching prefix among the installed routes.
    IP Connectivity › Routing Table and Path Selection
  5. Rank internal EIGRP, OSPF, IS-IS and RIP by default administrative distance, lowest first.
    Internal EIGRP 90, OSPF 110, IS-IS 115, RIP 120. External EIGRP routes carry 170, so they lose to every interior protocol listed here.
    IP Connectivity › Routing Table and Path Selection
  6. In Cisco NAT terms, what are the inside local and inside global addresses?
    Inside local is the private address a host actually has on the LAN, such as 10.1.1.10. Inside global is the public address that represents that host to the outside world after translation.
    IP Services › NAT and PAT
  7. In Cisco NAT terms, what are the outside global and outside local addresses?
    Outside global is the real public address of the remote host. Outside local is how that remote host appears to inside hosts — usually the same address unless the router also translates destinations.
    IP Services › NAT and PAT
  8. Which command permanently maps inside server 10.1.1.10 to public address 203.0.113.10?
    ip nat inside source static 10.1.1.10 203.0.113.10.

    Static NAT is one-to-one and lets outside users start connections to the server.
    IP Services › NAT and PAT
  9. Which command lets every host matched by ACL 1 share the public address on interface g0/1 using PAT?
    ip nat inside source list 1 interface g0/1 overload.

    The overload keyword turns NAT into PAT, telling sessions apart by port number.
    IP Services › NAT and PAT
  10. NAT is configured but show ip nat translations stays empty. What interface step is commonly forgotten?
    Marking the interfaces: ip nat inside on the LAN-facing interface and ip nat outside on the internet-facing one. Without them the router never translates.
    IP Services › NAT and PAT

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About these cards

Review status: Second-reader reviewed, with corrections applied.

Checked against:

  • Cisco CCNA 200-301 v1.1 exam topics — topic outline only; no text copied
  • Cisco IOS XE 17.16.1 and 17.18.1 YANG data models (YangModels/yang on GitHub) — command syntax, defaults and value ranges checked; no text copied

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