Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) (300-410) practice questions

Sample questions 16 of 159 shown

1. Q1

   Which routing protocol has the lowest default administrative distance for routes learned dynamically on a Cisco IOS router?

   1. OSPF (110)
   2. EIGRP internal (90)
   3. iBGP (200)
   4. RIP (120)

   EIGRP internal routes have AD 90, lower than OSPF (110), RIP (120), iBGP (200), and external EIGRP (170). When a destination is learned from multiple protocols, the route with lowest AD is installed.
2. Q2

   An engineer wants to change the AD of a single OSPF external route to 130. Which config achieves this?

   1. Under router ospf 1: distance 130
   2. Under router ospf 1: distance 130 0.0.0.0 255.255.255.255 1 (ACL 1 permits the prefix)
   3. Under router eigrp 1: distance 90
   4. Under interface: ip ospf cost 130

   The 'distance ad source-ip wildcard acl-number' command under OSPF selectively changes AD per prefix using an ACL. A bare 'distance 130' would change every OSPF route.
3. Q3

   Which IOS command applies a route-map SET-MED to outbound BGP advertisements toward neighbor 10.1.1.2?

   1. neighbor 10.1.1.2 route-map SET-MED in
   2. neighbor 10.1.1.2 route-map SET-MED out
   3. ip route-map SET-MED 10.1.1.2 out
   4. redistribute route-map SET-MED 10.1.1.2

   Inside BGP config, 'neighbor ip route-map name out' applies the route-map to updates sent to that neighbor. 'in' would filter/modify received routes.
4. Q4

   A route-map clause with no match statement and a permit action behaves how?

   1. Denies all routes
   2. Permits all routes that reach the clause
   3. Is rejected as invalid
   4. Acts the same as deny any

   A permit clause with no match matches every route and applies any set actions. It is commonly the final catch-all after earlier filter clauses.
5. Q5

   Which command summarizes EIGRP routes 10.1.0.0/24 through 10.1.3.0/24 outbound on an interface?

   1. ip summary-address eigrp 100 10.1.0.0 255.255.252.0
   2. summary-address eigrp 100 10.1.0.0/22
   3. ip summary-address 10.1.0.0 0.0.3.255 eigrp 100
   4. router eigrp 100 / network 10.1.0.0 0.0.3.255 summary

   EIGRP manual summarization uses 'ip summary-address eigrp AS network mask' under the interface. The four /24s combine into 10.1.0.0/22 (mask 255.255.252.0).
6. Q6

   What is the purpose of the Null0 route EIGRP installs when manual summarization is configured?

   1. Backup path for when summary fails
   2. Prevents routing loops by dropping traffic for unknown subnets within the summary
   3. Advertises the summary to BGP neighbors
   4. Improves convergence by feeding into the topology table

   EIGRP installs a discard route to Null0 for the summary block. Packets for subnets within the summary that the router doesn't know are dropped instead of potentially looping.
7. Q7

   Which command enables policy-based routing on an interface?

   1. ip route-map PBR
   2. ip policy route-map PBR
   3. policy route-map PBR in
   4. ip policy-based-routing PBR

   PBR is enabled on the ingress interface with 'ip policy route-map name'. The router evaluates the route-map for incoming packets before normal destination lookup.
8. Q8

   Which two commands create a VRF named CUSTOMER and place GigabitEthernet0/1 into it using legacy VRF-Lite syntax?

   1. ip vrf CUSTOMER and ip vrf forwarding CUSTOMER
   2. vrf definition CUSTOMER and ip vrf CUSTOMER
   3. vrf CUSTOMER and vrf member CUSTOMER
   4. ip vrf CUSTOMER and vrf forwarding CUSTOMER

   Legacy IPv4 VRF-Lite uses 'ip vrf name' globally then 'ip vrf forwarding name' on the interface. Newer syntax uses 'vrf definition name' and 'vrf forwarding name'.
9. Q9

   Which EIGRP named mode configuration would you use to configure EIGRP for both IPv4 and IPv6?

   1. address-family ipv4 and address-family ipv6 under the EIGRP named mode config
   2. router eigrp AS for IPv4 and ipv6 router eigrp AS for IPv6
   3. eigrp ipv4 and eigrp ipv6 under interface
   4. network ipv4 and network ipv6

   Named mode EIGRP uses 'router eigrp NAME' then 'address-family ipv4|ipv6 autonomous-system AS' sub-configs. This allows a single EIGRP instance to serve both address families.
10. Q10

    In OSPF, what LSA type is generated by an ASBR to advertise external routes?

    1. Type 3 (Summary LSA)
    2. Type 4 (ASBR Summary LSA)
    3. Type 5 (AS External LSA)
    4. Type 7 (NSSA External LSA)

    OSPF Type 5 LSAs are generated by ASBRs to advertise external routes into the OSPF domain. They are flooded throughout the entire OSPF domain except stub areas and NSSAs.
11. Q11

    Which OSPF area type blocks Type 3, 4, and 5 LSAs and injects a default route?

    1. Stub area
    2. Totally stubby area
    3. NSSA
    4. Standard area

    OSPF totally stubby area (Cisco proprietary) blocks Type 3/4/5 LSAs and injects a default Type 3 LSA. Only Type 1 and 2 LSAs are allowed.
12. Q12

    What is the default OSPF cost for a 10 Gbps link?

    1. 1
    2. 10
    3. 100
    4. 1000

    OSPF cost = reference-bandwidth / interface-bandwidth. With default reference-bandwidth of 100 Mbps: 100/10000 = 0.01, but minimum cost is 1.
13. Q13

    Which BGP attribute is Cisco-proprietary and checked first in the path selection algorithm?

    1. Weight
    2. Local Preference
    3. AS Path
    4. MED

    Weight is a Cisco-proprietary BGP attribute checked first. It is locally significant only to the router and higher weight is preferred. Default is 0 for learned routes, 32768 for locally originated.
14. Q14

    Which BGP well-known mandatory attribute is used for loop prevention?

    1. NEXT_HOP
    2. AS_PATH
    3. ORIGIN
    4. LOCAL_PREF

    AS_PATH is well-known mandatory. BGP routers reject updates that contain their own AS number in the AS_PATH, preventing routing loops. AS_PATH length is also used for path selection.
15. Q15

    Which OSPF LSA Type is also known as the Network LSA?

    1. Type 1
    2. Type 2
    3. Type 3
    4. Type 5

    Type 2 (Network LSA) is generated by the DR on multi-access networks. It lists all routers attached to that segment including the DR itself.
16. Q16

    In BGP, what is the purpose of the Local Preference attribute?

    1. Influences outbound traffic from the AS
    2. Prevents routing loops
    3. Sets the next-hop address
    4. Defines the route origin

    Local Preference indicates the preferred path for outbound traffic from the local AS. Higher value is preferred. It is exchanged between iBGP peers only.

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