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Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
In TCAM Value entries
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF

2. What is the operational mode of a switch port that carries traffic for multiple VLANs?
1000BASE-T full duplex followed by 1000BASE-T half duplex
Trunk
The switch port falls back to default setting of half duplex
Carrier Sense Multiple Access Collision Detection

3. What is the original standard for Ethernet (10 Mbps)?
IEEE 802.3
Static access or dynamic
Interconnecting switches in a campus network
Switch(config)#interface {type}{module}/{number}

4. Displays the entire Forwarding Information Base (FIB)
Accelerated CEF (aCEF)
Switch#show ip cef
Numeric values that represent what action to take after the TCAM lookup occurs
Trunk

5. What is a ternary combination?

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6. What Ethernet ports allow for autonegotiation?
Down - static access - trunk or tunnel
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
UTP Fast Ethernet and Gigabit Ethernet
Switch(config)#errdisable detect cause udld

7. What is the default duplex mode of a Gigabit Ethernet interface?
Full duplex
Switch#show adjacency [{interface}] [summary | detail]
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch#show interfaces status err-disabled

8. Displays switch port information for a specified interface
Distributed CEF (dCEF)
Switch#show interfaces {interface} switchport
Tunnel
SC or MT-RJ

9. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
CEF glean
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
10 km

10. Adds a description to an interface configuration
Switch(config-if)#description {string}
Switched virtual interface (SVI)
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
Distributed CEF (dCEF)

11. What are the classes of Physical Media Dependent (PMD) interfaces defined by IEEE 802.3ae?
LAN PHY and WAN PHY
Slow response times - low throughput - runts and other input errors on the switch ports
When one station transmits at the same time as another on a shared medium
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

12. What is 100BASE-TX?
The Punt adjacency
Store-and-forward
Switch(config)#errdisable detect cause rootguard
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

13. What is 10GBASE-X?
XENPAK - X2 - or SFP+
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Cabling specifications for 10 Gigabit Ethernet
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

14. What is the maximum cabling distance for 1000BASE-SX?
Process the first packet in a traffic flow to determine the destination
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
The Punt adjacency

15. What is the timer range for automatic re-enabling of error-disabled ports?
Switch(config)#errdisable detect cause vmps
From 30 seconds to 86 -400 seconds (24 hours)
Manually by administratively disabling and re-enabling the port
The switch port falls back to default setting of half duplex

16. What is 10GBASE-ER/EW?
Switched virtual interface (SVI)
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
IEEE 802.3ab
CEF punt

17. What is the standard for Fast Ethernet (100 Mbps)?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
IEEE 802.3u
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
CEF glean

18. What is the content of TCAM Result entries?
Numeric values that represent what action to take after the TCAM lookup occurs
10 km
Accelerated CEF (aCEF)
15 metres

19. What is the standard for 10 Gigabit Ethernet (10GbE)?
Switch#show errdisable detect
IEEE 802.3ae
American National Standards Institute
Switch(config)#errdisable detect cause l2ptguard

20. Displays CEF Punt statistics with number of packets and reason for each line card
Store-and-forward
Switch#show cef not-cef-switched
CEF punt
Native routed interface

21. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Half duplex
Dynamic
Switched virtual interface (SVI)

22. Removes entries from the CAM table
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Security and QoS ACLs
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

23. What connectors can be used with SFP modules?
Switch(config)#errdisable detect cause gbic-invalid
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
Switch(config-if)#no ip route-cache cef
LC - MT-RJ or RJ-45

24. Selects multiple switch port interfaces at the same time and enters interface configuration mode
IEEE 802.3u
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]

25. How are packets marked before being sent to the CEF Layer 3 engine for further processing?
Switch(config)#interface {type}{module}/{number}
CEF punt
Institute of Electrical and Electronics Engineers
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

26. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
Ternary Content-Addressable Memory
Switch#show errdisable recovery
10GbE operates only at full duplex
R = LAN PHY; W = WAN PHY

27. What is the maximum cabling distance for 1000BASE-CX?
25 metres
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
The Punt adjacency
Switch(config)#errdisable detect cause rootguard

28. Enables error-disable when a link is seen to be unidirectional
Slow response times - low throughput - runts and other input errors on the switch ports
Switch(config)#errdisable detect cause udld
ANSI X3T11 FibreChannel
CEF glean

29. What is a GigaStack GBIC?
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch(config)#errdisable detect cause security-violation
Switch(config-if)#switchport access vlan {vlan}

30. Enables error-disable for rate-limiting of DHCP snooping
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch#show errdisable detect
XENPAK - X2 - or SFP+
On

31. What is the default duplex mode of a Fast Ethernet interface?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
They are dropped (ARP throttling)
Switch(config)#errdisable detect cause ilpower
Half duplex

32. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
LOU registers
Switch(config)#no ip cef

33. What is 10GBASE-CX4?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
SVI or native routed interface

34. What are the reasons for packets being punted by CEF?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
American National Standards Institute
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure

35. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
Switch#show running-config interface {interface}
Creating the VLAN
The Layer 3 forwarding engine
SC or MT-RJ

36. What is 1000BASE-X?
The Punt adjacency
Slow response times - low throughput - runts and other input errors on the switch ports
American National Standards Institute
Cabling specifications for Gigabit Ethernet

37. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
Native routed interface
Switch(config)#errdisable detect cause rootguard
FIB with adjacency table
IEEE 802.3

38. How does topology based switching work?
Switch(config)#errdisable detect cause l2ptguard
Collision domain
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding

39. What changes are made to packets by the CEF packet rewrite engine just before forwarding?
CEF punt
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)

40. What is error-disable state?
Half duplex
Security and QoS ACLs
A switch port that has been shut down automatically due to a serious error condition
LOU registers

41. What is the DTP negotiation mode of a switch port configured as static access?
Switch(config-if)#switchport mode access
A station must wait its turn to transmit; it can't transmit and receive at the same time
Off
Configure the appropriate values manually on both ends of the link

42. How are MAC addresses shown in the detailed output from the CEF adjacency table?
Route caching and topology based
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Switch(config-if)#shutdown
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

43. What is 1000BASE-ZX?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Switch(config)#errdisable detect cause gbic-invalid

44. What is 100BASE-FX?
Switch(config)#errdisable detect cause storm-control
Switch#show interfaces {interface}
100 metres
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

45. Configures the maximum ageing time for entries in the MAC address table
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
Switch(config)#mac address-table aging-time {seconds}
Switch(config)#errdisable detect cause loopback
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

46. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Feature Manager (FM) and Switching Database Manager (SDM)
Switch(config)#errdisable detect cause vmps
Tunnel
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed

47. What is 100BASE-T4?
Route caching and topology based
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

48. What are the reasons for packets being dropped by CEF?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Switch#show interfaces {interface} switchport
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Full duplex only

49. What denotes the number of times a CEF entry has been updated since the CEF table was created?
SVI
On
The CEF entry version number
Accelerated CEF (aCEF)

50. How is link speed determined on Fast Ethernet links configured to autonegotiate?
A three-fold combination of 0 - 1 and X (don't care)
Switch(config)#errdisable detect cause pagp-flap
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch(config)#errdisable detect cause unicast-flood